Experiment VII
.docx
keyboard_arrow_up
School
Portage Learning *
*We aren’t endorsed by this school
Course
103
Subject
Chemistry
Date
Feb 20, 2024
Type
docx
Pages
2
Uploaded by nothere33 on coursehero.com
Chemistry Lab Report
Name: Date:
06/06/2022
Experiment #: 7
Title:
Molality Colligative Properties
Purpose:
To demonstrate the Molality Colligative Properties of Freezing Point Depression
Procedure: We will be using salts NaCl and CaCl
2
to make ice cream
1.
Get two large zip lock bags containing ice (1 gallon) and label each bag the name of the salt we will be using
2.
Get two large zip lock bags containing mixture of milk, vanilla, and sugar and label each bag the name of the salt we will be using
3.
Obtain 0.5 mol of NaCl and CaCl
2 and place them in two separate cups
4.
Add 0.5 mol NaCl into the ice bag labeled NaCl and mix it
Do the same with 0.5 mol CaCl
2
5.
Then put the bag containing the ice cream mixture into each ice bag.
6.
Put each bag in a shaker and leave it in there for 15 minutes
7.
Data/Results/Calculations:
NaCl: ion production
1 NaCl
1 Na
+
+ 1 Cl
-
2 moles of ions were produced.
Calculation of Molality
Molality(m) = mol solute/ kg of solvent
24g NaCl (1 mol NaCl/ 58g) (2 mol ions/ 1 mol NaCl= 1.0 mole NaCl ions
0.5 mol NaCl
0.5 mol Na
+
+ 0.5 mol Cl
-
m= 1 mol NaCl/ 0.25 kg= 4 m NaCl
CaCl
2
: ion production
1 CaCl
2
1 Ca
2+
+ 2 Cl
-
3 moles of ions were produced
Chemistry Lab Report
Calculation of Molality
55.5g of CaCl
2 (1 mole CaCl
2
/111g) (3 mol ions) (1 mol CaCl
2
) = 1.5 mol CaCl
2
ions
0.5 mol CaCl
2
0.5 mol Ca
2+
+ 1 mol Cl
-
m= 1.5 mol CaCl
2
ions/0.25 kg = 6 m CaCl
2
Temperature Depression
Change in T= k
f
x m
k
f
= 1.86
C/m for H
2
O
NaCl
Change in T= k
f
x m
Change in T= (1.86
C/m) x 4 m = 7.44
C
CaCl
2
Change in T= k
f
x m
Change in T= (1.86
C/m) x 6 m = 11.2
C
Conclusions:
In this lab we were able to calculate the molality of a salt when dissolve in ice. This technique is used to created ice and, in this lab, we observe and compare salts NaCl and CaCl
2
. Both salts are colligative properties which mean when they were added to and dissolve in ice, they will lower the freezing point temperature. NaCl has a molality of 4 m and change in temperature of 7.44
C. While CaCl
2
has a molality of 6 m and change in temperature of 11.2
C. In the lab we were able to see that CaCl
2 ice cream melted faster than NaCl which proves that NaCl has a higher freezing point.
Notes:
Salt is a Colligative Property
o
Colligative property: whenever a dissolve solute into a solvent, it lowers the FP.
Molality(m) = mol solute/ kg of solvent
Molarity(M)= mol/L
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
Related Questions
A sample of 14000 ppm iron is Strong Acid has to be diluted between 95 and 180 ppm. The method chosen was to dilute in three dilutions of 100 mL each. The first dilution is a 1/5, the second dilution is a 1/6 and the third dilution is a 1/3. Determine how much of each component goes in each tube. Determine the concentration of each tube. Are we within the proper range?
arrow_forward
Using M1V1=M2V2
Make 100ml of a solution that contains 0.5mM MgCl2, 15 mM CaCl2 and 120 mM KCl 0.5M of each of these chemicals.
arrow_forward
Main Goal: Convert the experimental glucose concentration from mM (millimolar) to g/100 mL.
Take the 1/100 dilution factor into consideration
Molarity will open the doors for you to get to grams.
Once at M assume 1L of solution. (Hint: this will help you when converting from M to moles)
You will also need to calculate the molar mass of glucose which has the formula C6H12O6
There are 5 steps in total
Task 1: Write a step-by-step guide with key words for the students on how to do these calculations. Ensure the steps are clearly written and easy to follow.
arrow_forward
Commercial bleach is usually 5% solution of hydrochloric acid.
true or false
arrow_forward
Given that liquid alum is used as a coagulant. Specific gravity of alum is 1.33. One gallon ofalum weighs 11.09 pounds (5.03 kg) and contains 5.34 pounds (5.42 kg) of dry alum.Determine: (a) mL of liquid alum required to prepare a 100 mL solution of 20,000 mg/L alumconcentration, (b) the alum concentration, (c) the dosage concentration of 1 mL of stocksolution in a 2000 mL Gator jar sample.• Determine alum concentration in mg/L• Prepare 100 ml stock solution having a 20,000 mg/L alum concentration• Calculate mL (y) of liquid alum to give 2000 mg• Find 1 mL of alum concentration (z) in 2000 mL sample (jar)
arrow_forward
Calculate the concentration in ppm of Cd in a 2.00 mL sample which has been shown to contain 16.4 μg Cd. Assume the sample has a density of 1.00 g/mL. Show your work for full credits (just explain step by step and put the answer at the end)
arrow_forward
Reading for the unknown solution:
Trial 1: 7.3
Trial 2: 6.8
Trial 3: 7.3
Reading for the distilled water:
Trial 1: 0.9
Trial 2: 0.8
Trial 3: 0.8
How did the answer happen?
Show complete solution
Normality of Agno3 is: N/50 = 0.02
arrow_forward
Table 1. Miscibility of Coconut Oil and Solubility of Cholesterol
Solvents
Coconut Oil
Cholesterol
Water
Ethanol
Chloroform
Ether
Guide Questions:
At which solvents are coconut oil and cholesterol miscible/soluble? Explain why.
________________________________________________________________________________________________________________________________________
During washing oily dishes, it is not enough to just use water. We need to use soap. Explain the function so soap in this situation.
________________________________________________________________________________________________________________________________________
Table 2. Spot Test
Substance
Observation
Inference
(Volatile or Non-volatile)
Coconut oil
Glycerol
Ethanol
Ether
Guide Question:
What does it mean when something is volatile?…
arrow_forward
ANSWER THEM ALL FOR AN UPVOTE. ASAP PLEASE.
The theoretical weight of 10 tablets is 9.35g. Each tablet contains 425mg of the active ingredient. Using this data, determine the amount of additive needed to prepare 160, 000 tablets.
How many grams of drug are required to make 500ml of 25.0% solution?
arrow_forward
a 5% solution has been poured into a container already containing some solution. the total volume is now 300 ml and its concentration is 4.5%. how many ml of the 5% solution were poured in?
Show work on how to get the answer. The answer is 270 ml
arrow_forward
How many microliters of a 904.0 ppm Co2+904.0 ppm Co2+ stock solution are required to prepare 20.00 mL20.00 mL of a 19.0 ng/?L Co2+19.0 ng/μL Co2+ solution?
Significant figures are graded for this problem. Be sure you do not round your answers until the very end of your calculations.
arrow_forward
Briefly explain why the 1-mL pipette has a lower percent tolerance level in the range 300-1000 than when delivering 30 of solution.
arrow_forward
What volume must 100.0 mL of 0.500 M sulfuric acid solution be diluted to prepare 0.200 M sulfuric acid solution?
Group of answer choices
140. mL
150. mL
250. mL
350. mL
40.0 mL
arrow_forward
Which of the following is/are proper lab techniques in solution preparation?
Choose one or more best answer:
a. Quickly adding 90mL of distilled water onto 10mL of concentrated acid to make 100mL of diluted acid solution
b. Adding NaOH pellets in the volumetric flask and immediately diluting to mark
c. Quantitatively transferring dissolved solids from a beaker by pouring washings into the final container
d. Using cold distilled water to dilute a solution to mark so it does not get hot
e. Using a volumetric pipette when applicable to get the most accurate aliquot volume
f. After diluting to around 90mL before the mark, transfer the solution into a beaker to cool down more efficiently.
g. Storing everything in plastic containers as plastic is more inert than glass for most chemicals
Note: Just answer, no explanation needed. Thanks
arrow_forward
Experimental Design:
Consider a group that must make 2M NaCl in a total volume of 100 mL water using glassware. Make a list of steps that a partner could follow on how to make this solution.
arrow_forward
Drug Stock solution concentration = 10 millimolars
Desired drug solution concentration = 10 micromolars
The final solution will be inserted into a well that can hold 8 to 10 mL of solution.
How much stock solution and solvent must be used to change the 10 millimolars stock solution to 10 micromolars?
arrow_forward
For results/conclusions
Using the images attached
Write 2 paragraphs
1st paragraph: Starts with Objective. Results of DeltaT and i stated
2nd paragraph: sources of errors discussed
The objective is The colligative properties are the properties that undergo a change when a solute is introduced to a solvent. Freezing point depression is also a colligative property. The addition of a solute to a solvent reduces the freezing point of the resulting solution. The freezing point of the solution is always lower than the freezing point of the solvent. This difference in the freezing point between solvent and solution is called freezing point depression. The freezing point depression is directly proportional to the molality of the solution or the number of moles of solute present in the solution.
arrow_forward
The amount of caffeine was influenced by the temperature of water used to brew, and the time of brewing.
The concentration of caffeine is dependent on the volume of water used for brewing.
Both statements are correct.
1st statement is True. 2nd statement is False.
1st statement is False. 2nd statement is True.
Both statements are False.
arrow_forward
Using Dimensional Analysis show all work to calculate the mass of a solution prepared from 100 mL DI water (density = 1.00 g/mL) and 5 g NaCl (s).
arrow_forward
a. Convert 52.6 mM (millimolar) to μM (micromolar) and to M (molar).
b. Convert 200.0 μM to mM (millimolar) and to M (molar).
c. The new U.S. Public Health Service optimal fluoride concentration in water is 0.700 mg/L. Convert this value to M (molar) and to ppm.
Upload your responses here.
arrow_forward
Cedrick and Astrid a 20.00 ml aliquot of grapefruit juice with a 0.165 M NaOH solution to the end point. The initail buret reading was 1.72ml and final buret reading was 15.51ml.
They calculated that there was 0.1457g of citric acid present in the juice sample. What is the amount mg of citric acid present per ml of juice?
the answer is 7.29mg/ml. (can you please show me how to calculate this answer)
arrow_forward
Mikaela is a STEM student who is currently having her General Chemistry 2 subject.Today, she is asked by her teacher to prepare a CuSO4 solution. Help her do her task byfollowing the procedure and answering the question below.1. Obtain a sample of CuSO4 from the front bench.2. Using your scale, weigh out 18g of CuSO4.3. Dissolve the 18g of CuSO4 in 100 mL of distilled water.4. Stir until you have reached a homogeneous solution with all the solute dissolvedin the solvent.Calculate the concentration of your solution (M in mol/ L of CuSO4). Show your workin the space provided below.
arrow_forward
MULTIPLE CHOICE: Choose the letter of the best answer
Please answer all questions correctly
1. The standardization of volumetric solution does not require hydrochloric acid.
A. Permanganometry
B. Cerimetry
C. Iodimetry
D. lodometry
E.All of the choices
2. In the standardization of its volumetric solution, the primary standard is dried to constant weight, which means drying shall be continued until two consecutive weighings do not differ by more than 0.50 mg.
A. Permanganometry
B. Cerimetry
C. Iodimetry
D. lodometry
E.All of the choices
3. In the standardization of its volumetric solution, potassium iodide was added to
A. Permanganometry
B. Cerimetry
C. Iodimetry
D. lodometry
E.All of the choices
4. Starch is the indicator of choice for these procedures because it forms intense blue coloration with the solution.
A. Permanganometry
B. Cerimetry
C. Iodimetry
D. lodometry
E. C and D
5. In the standardization of its volumetric solution, the reaction needs to be…
arrow_forward
Identify whenther the statement are TRUE or FALSE
1. Sedimentation time of a given particle will be zero when the density of the particle and the solvent are equal.
2. Sedimentation time depends on the shape of the particle
arrow_forward
Which of the following are considered solution samples? Select all that apply.
A. natural waters
B. milk
C. capsules
D. seawater
E. blood
F. sediments
G.commercial solvents
H. aerosol particulates
arrow_forward
A soil sample from my front lawn has a higher than normal salinity. What might be 2 logical reasons for this?
arrow_forward
Calculations/Results:*Show all work with units for each calculation below. Each answer must contain the correct units and the correct number of significant figures.
Solvent
Mass of solvent (in grams) _________________
Mass of solvent (in kilograms) _______________
Concentration of Sucrose
(a) Mass/volume percent of the solution ___________________
(b) Mass/mass percent of the solution ____________________
(c) Molarity of the solution ______________________________
(d) Molality of the solution _______________________________
Dilution Calculations
Calculated molarity of the sucrose solution from Part 1: __________
arrow_forward
A 1 mL microbial suspension comparable to 1 mL of 1.0 McFarland standard was subjected to a series of dilutions. An aliquot of 0.2 mL was transferred into a 100-mL volumetric flask and diluted with sterile saline solution to its final volume. Then a 0.1 mL of the resulting solution was transferred into a 50-mL volumetric flask diluted to its final volume. What would be the final concentration?
arrow_forward
5.300. mL of a 18.0 M solution of H2SO4 acid has enought water added to it to make a new volume of 1.00 L. What is the new concentration?
Numerical answer:
Unit:
Label:
Blank 1:
Blank 2:
Blank 3:
6.What is the concentration, in ppm, if 0.00021 g of Arsenic (As) was found in 3126 g of drinking water?
Numerical answer:
Unit:
Label:
Blank 1:
Blank 2:
Blank 3:
arrow_forward
Learning Task No. 4: Use the sample problem as a guide to help you solve the % concentration of your prepared solution. Dissolve 10.0g of a substance in 100.0g of water., the concentration by mass will be: Divide the mass of the solute by the total mass of the solution. c%=10.0g10.0g+100.0g* 100%=9.09 Solutions to make: 1. 450 g flour and 1 L water 2. 500 ml alcohol and 1 L water 3. 300 g rice grains and 540 ml water 4. 450 g sugar and 360 ml coconut milk 5. 50 ml liquid detergent and 250 ml water
arrow_forward
A. Density Computation. Solve what is asked. Round off your answers into 2 decimal places and make sure to place the appropriate unit. Encircle your final answer.5. A flask that weighs 342.5 g is filled with 223 mL of carbon tetrachloride. The weight of the flask and carbon tetrachloride is found to be 702.55 g. From this information, calculate the density of carbon tetrachloride.
Please provide complete solution
arrow_forward
Please answer question and just send me the paper solutions asap dont type the answer question 3and 4
arrow_forward
Density Lab (Need help plotting this graph)
How to plot this graph from the data sheet (see picture attached) with mass of solution (on y-axis) vs volume of solution (on x-axis) for the 0%, 10%, 20%, 30%, 40%, 50%, 60% sucrose solutions so that it is all on one graph? There should be seven sets of data with seven best-fit lines on one graph. The y-intercept of the best-fit line is set to 0. Please include how to setup the data in excel spreadsheet to plot the graph.
Thank you
arrow_forward
Methyl salicylate Emulsion (Forbes Bottle Method)SOLVE FOR ITS WEIGHT/VOLUME REQUIRED TO MAKE 30 ML. SHOW COMPLETE SOLUTION. I NEED IT ASAP AND ANSWER THEM ALL FOR AN UPVOTE.
COMPONENTS
WEIGHT/ VOLUME REQUIRED
Methyl salicylate Oil
?
Acacia powder
?
Purified water
?
TO MAKE
30 ml
arrow_forward
1. Based on your experimental and product label observations, how do regular and diet coladiffer?2. When you calculate the density of either regular or diet cola, does the size of thesample matter? Explain your answer
arrow_forward
The unknown salt you will be identifying is composed of one of the 6 anions and one of the 6 cations studied during previous weeks of lab. However, the list is not endless. An obvious physical property can be used to eliminate some salts. Another physical property can imply or eliminate possibilities as well. During this lab, what are two physical properties that can be used?
arrow_forward
SEE MORE QUESTIONS
Recommended textbooks for you
Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Chemistry
Chemistry
ISBN:9781259911156
Author:Raymond Chang Dr., Jason Overby Professor
Publisher:McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning
Organic Chemistry
Chemistry
ISBN:9780078021558
Author:Janice Gorzynski Smith Dr.
Publisher:McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Elementary Principles of Chemical Processes, Bind...
Chemistry
ISBN:9781118431221
Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:WILEY
Related Questions
- A sample of 14000 ppm iron is Strong Acid has to be diluted between 95 and 180 ppm. The method chosen was to dilute in three dilutions of 100 mL each. The first dilution is a 1/5, the second dilution is a 1/6 and the third dilution is a 1/3. Determine how much of each component goes in each tube. Determine the concentration of each tube. Are we within the proper range?arrow_forwardUsing M1V1=M2V2 Make 100ml of a solution that contains 0.5mM MgCl2, 15 mM CaCl2 and 120 mM KCl 0.5M of each of these chemicals.arrow_forwardMain Goal: Convert the experimental glucose concentration from mM (millimolar) to g/100 mL. Take the 1/100 dilution factor into consideration Molarity will open the doors for you to get to grams. Once at M assume 1L of solution. (Hint: this will help you when converting from M to moles) You will also need to calculate the molar mass of glucose which has the formula C6H12O6 There are 5 steps in total Task 1: Write a step-by-step guide with key words for the students on how to do these calculations. Ensure the steps are clearly written and easy to follow.arrow_forward
- Commercial bleach is usually 5% solution of hydrochloric acid. true or falsearrow_forwardGiven that liquid alum is used as a coagulant. Specific gravity of alum is 1.33. One gallon ofalum weighs 11.09 pounds (5.03 kg) and contains 5.34 pounds (5.42 kg) of dry alum.Determine: (a) mL of liquid alum required to prepare a 100 mL solution of 20,000 mg/L alumconcentration, (b) the alum concentration, (c) the dosage concentration of 1 mL of stocksolution in a 2000 mL Gator jar sample.• Determine alum concentration in mg/L• Prepare 100 ml stock solution having a 20,000 mg/L alum concentration• Calculate mL (y) of liquid alum to give 2000 mg• Find 1 mL of alum concentration (z) in 2000 mL sample (jar)arrow_forwardCalculate the concentration in ppm of Cd in a 2.00 mL sample which has been shown to contain 16.4 μg Cd. Assume the sample has a density of 1.00 g/mL. Show your work for full credits (just explain step by step and put the answer at the end)arrow_forward
- Reading for the unknown solution: Trial 1: 7.3 Trial 2: 6.8 Trial 3: 7.3 Reading for the distilled water: Trial 1: 0.9 Trial 2: 0.8 Trial 3: 0.8 How did the answer happen? Show complete solution Normality of Agno3 is: N/50 = 0.02arrow_forwardTable 1. Miscibility of Coconut Oil and Solubility of Cholesterol Solvents Coconut Oil Cholesterol Water Ethanol Chloroform Ether Guide Questions: At which solvents are coconut oil and cholesterol miscible/soluble? Explain why. ________________________________________________________________________________________________________________________________________ During washing oily dishes, it is not enough to just use water. We need to use soap. Explain the function so soap in this situation. ________________________________________________________________________________________________________________________________________ Table 2. Spot Test Substance Observation Inference (Volatile or Non-volatile) Coconut oil Glycerol Ethanol Ether Guide Question: What does it mean when something is volatile?…arrow_forwardANSWER THEM ALL FOR AN UPVOTE. ASAP PLEASE. The theoretical weight of 10 tablets is 9.35g. Each tablet contains 425mg of the active ingredient. Using this data, determine the amount of additive needed to prepare 160, 000 tablets. How many grams of drug are required to make 500ml of 25.0% solution?arrow_forward
- a 5% solution has been poured into a container already containing some solution. the total volume is now 300 ml and its concentration is 4.5%. how many ml of the 5% solution were poured in? Show work on how to get the answer. The answer is 270 mlarrow_forwardHow many microliters of a 904.0 ppm Co2+904.0 ppm Co2+ stock solution are required to prepare 20.00 mL20.00 mL of a 19.0 ng/?L Co2+19.0 ng/μL Co2+ solution? Significant figures are graded for this problem. Be sure you do not round your answers until the very end of your calculations.arrow_forwardBriefly explain why the 1-mL pipette has a lower percent tolerance level in the range 300-1000 than when delivering 30 of solution.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistryChemistryISBN:9781259911156Author:Raymond Chang Dr., Jason Overby ProfessorPublisher:McGraw-Hill EducationPrinciples of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
- Organic ChemistryChemistryISBN:9780078021558Author:Janice Gorzynski Smith Dr.Publisher:McGraw-Hill EducationChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningElementary Principles of Chemical Processes, Bind...ChemistryISBN:9781118431221Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. BullardPublisher:WILEY
Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Chemistry
Chemistry
ISBN:9781259911156
Author:Raymond Chang Dr., Jason Overby Professor
Publisher:McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning
Organic Chemistry
Chemistry
ISBN:9780078021558
Author:Janice Gorzynski Smith Dr.
Publisher:McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Elementary Principles of Chemical Processes, Bind...
Chemistry
ISBN:9781118431221
Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:WILEY