A second spectrophotometric method for the quantitative analysis of Pb2+ in blood yields an Ssamp of 0.712 for a 5.00 mL sample of blood. After spiking the blood sample with 5.00 μL of a 1560 ppb Pb2+ external standard, an Sspike of 1.546 is measured. What is the concentration of Pb2+ in the original sample of blood?
Q: A method for the analysis of Ca2+ in water suffers from an interference in the presence of Zn2+.…
A: Consider the concentration of Zn+2 = 1 The concentration of Ca+2 = 100 The given…
Q: Prepare standard solutions for the spectrophotometric measurement of iron in an unknown solution.…
A: Serial dilution refers to stepwise dilution by keeping the dilution factor constant. Dilution factor…
Q: 3. Internal Standard. A solution containing 3.47 mM X (analyte) and 1.72 mM S (standard) gave peak…
A: Response factor is obtained from are of analyte peak and standard peak and concentration of analyte…
Q: Table 1. Data on EDTA Standardization Weight of CaCO3 (g): 0.2003g Trial Volume of EDTA (mL)…
A: Each of Ca2+ is neutralised with 1 mol of EDTA. Also, No of moles = Mass / Molar mass
Q: (3) In a titration, the % analyte is computed from the following equation: Vol (titrant) x M…
A:
Q: A 100.0-ml sample of boiler feed water, analyzed for hardness, required 36.8 ml of 0.0386 M EDTA to…
A:
Q: A solution containing 2.50 mM X (analyte) and 1.20 mM S (standard) gave peak areas of 2509 and 7132…
A: Since you have asked a multiple sub-part question, we will solve first 3 sub-parts for you. For…
Q: A 0.1475-M solution of Ba(OH)2 was used to titrate the acetic acid (60.05 g/mol) in a dilute aqueous…
A: w/v percentage of acetic acid in each of the sample 1 to 4 are required to calculate the mean w/v…
Q: Prepare 1000ppm of Cd (NO3).4 H2O in a liter, then preprare from the 1000ppm(which is a stock)…
A: Given information, (a) Concentration (in ppm) of Cd(NO3).4H2O = 1000 ppm Volume of solution = 1 L =…
Q: A potassium hydrogen phthalate solution was prepared by adding 0.0996 g of dry potassium hydrogen…
A: Here given that, Mass of dry potassium hydrogen phthalate = 0.0996 g So number of mols of…
Q: Calculate the pl values after addition of the following volume 0.0500 M NH41 to 30.00 mL 0.0500 M…
A: The volume of AgNO3 = 30.00 mL The molarity of AgNO3 = 0.0500 M The moles can be calculated as…
Q: To quantify the amount of ethanol in a beverage, a technician prepared the first solution which…
A: Gas chromatography (GC) is an analytical technique that is used for detection and quantification of…
Q: A solvent passes through a chromatography column in 3.87 min, but the solute requires 7.60 min. What…
A: Answer :- 1) Retention factor (k) = 0.964 2) tfraction in mobile phase = 0.51 3) Distribution…
Q: According to HPLC analysis by internal standard addition the calibration equation is as follows: y =…
A: Introduction: HPLC stands form High Performance Liquid Chromatography or High Pressure Liquid…
Q: A solution of Ba (OH), was standardized against 0.1208 g of primary-standard-grade benzoic acid,…
A: Given 0.1208 g of benzoic acid, volume of base = 43.94g We have to find molar concentration of base…
Q: An analyst determines the Cl^- content of rain water with ion chromatography. The data for the…
A: There is a high probability that an analytical instrument will produce a signal noise whenever a…
Q: Consider the following method for the analysis of cocaine (MW 303.35) powder. "Dissolve about 600 mg…
A: Given the mass of cocaine powder weighed = 606.3 mg molarity of HClO3 used = 0.09978 M Volume of…
Q: 20 ml of 0.1 N Ammonia diluted to 60 ml with water. (kb = 1.8 x 10-5) pH = pKw –;pKb +logC What is…
A: First calculate the pKb using below the relation and substitute Kb is 1.8×10-6…
Q: A student researcher performed a chromatographic separation of caffeine and aspartame. The retention…
A:
Q: What are the differences between systematic and random errors and how do they effect accuracy and…
A: As per the Bartleby guidelines, an expert is allowed to answer one question at a time. Please repost…
Q: nL of the unknown were pipetted into each of five 50.0-ml volumetric flasks. Various volumes of a…
A:
Q: 625 nm, which can be used for the spectrophotometric determination of ammonia. ocr -OH • NH,…
A: Soln
Q: A student researcher performed a chromatographic separation of caffeine and aspartame. The retention…
A: Given tc = 209.6 sωc = 14.4 sta = 260.0 sωa = 21.2 sd = 22.1 s
Q: 1. What is the MW of the analyte? 2. What is the meq of the analyte? 3. What will be the weight (in…
A: Since you have asked a question with multiple subparts we will answer the first three for you. To…
Q: II. Determination of Total Hardness of Water Source of water sample: Volume of water sample 22.00 mL…
A: Given that, Volume of EDTA solution consumed (V1)=14.06mL Molarity of standard EDTA solution used…
Q: A titrimetric method for the determination of calcium in limestone was tested by analysis of an NIST…
A: The confidence interval can be calculated using the following formula:
Q: A 0.1475-M solution of Ba(OH)2 was used to titrate the acetic acid (60.05 g/mol) in a dilute aqueous…
A: In order to find the mean w/v percentage of acetic acid in the sample. we have to find the w/v…
Q: A mixture of three components is separated using paper chromatography, and each component is…
A: Given: Absorbance of standard solution- Compound A = 0.72 Compound B = 0.55 Compound C = 0.80 For…
Q: A mixture of three components is separated using paper chromatography, and each component is…
A: Given: Absorbance of standard solution- Compound A = 0.72 Compound B = 0.55 Compound C = 0.80 For…
Q: 25 ml of pickled brine was taken from an apple pickled with vinegar and diluted to 500 ml, 25 ml of…
A: The dilution law is shown below: N1V1 = N2V2 where; N1 = normality of unknown acid/base V1 = volume…
Q: 25 nm, which çan be used for the spectrophotometric determination of ammonia. OCF 2 OH + NH3…
A: Solution -
Q: 4. determine the amount in mg of the amount of Ag present from ICP mass digested: 1.0821g/L dilution…
A: Inductively coupled plasma mass spectrometry, commonly known as ICP-MS, is one type of spectrometry…
Q: 1. What is the MW of the analyte? 2. What is the meq of the analyte? 3. What is the weight (in…
A: Since you have asked a question with multiple subparts we will answer the first three for you. To…
Q: 1a) Hexane, CH3(CH2)4CH3, is found to have a long retention time when separated from a mixture. A…
A: A) Hexane is a non-polar molecule. It will easily dissolve in the non-polar solvent or have higher…
Q: 2. A spectrophotometric method for the quantitative determination of the concentration of Pb in…
A: Given:- To find the concentration of the lead in the blood sample and its equation is:…
Q: Internal standard (As , Cs ), analyte with known concentration (Ax , Cx ) In a chromatographic…
A: Formula used: Area of analyte signalConc of analyte= F×Area of standard signalConc of…
Q: The following data are from the HPLC assay of paracetamol 500 mg tablets using the calibration curve…
A: HPLC stands for High-Performance Liquid Chromatography. It is a technique that is used to separate…
Q: A solution containing 3.51 mM X (analyte) and 1.67 mM S (internal standard) gave peak areas of 3505…
A: Given : Solution containing 3.51 mM X(analyte) & 1.67 mM S(internal standard) gave…
Q: A new method is proposed to simultaneously detectand separatefour foodadditives by reversed-phase…
A: (a) The mathematical expression for calculating the number of plates is: N=16(tRW)2
Q: 2. A water sample from a local cave system was tested for total water hardness. An EDTA titer was…
A: The question is based on the concept of complexometric titrations. We have to calculate hardness of…
Q: Explain temperature programming for gas chromatography and what its benefits.
A: Temperature programming is used to run a large fraction of all gas chromatography. In this the…
Q: der the peaks for pentafluorobenzene and benzene in the gas chromatogram shown here. The elution…
A: Given data: Elution time for unretained solute = 1.06 min Length of column = 30 m Diameter of column…
Q: A mixture of three components is separated using paper chromatography, and each component is…
A: Given: Absorbance of standard solution- Compound A = 0.72 Compound B = 0.55 Compound C = 0.80 For…
Q: In a reversed phase liquid chromatography separation, what trend in k’ (capacity factor), α…
A: The effect of solvent system on the capacity factor, selectivity and resolution in reverse phase…
Q: . A third spectrophotometric method for the quantitative analysis of Pb in blood yields an Ssamp Of…
A: Concentration of Pb2+ in original sample can be calculated using standard addition method. In which…
Q: A GC separation was conducted on a sample containing a 14) pesticide analyte, Pymetozine. This…
A: First we need to find out the RF value by using given infomation - AAN = 2791, CAN = 15.0ppm AIS =…
Q: Standard Solutions for FENCS2* Ion Beer-Lambert Plot mL of 2.00 x 101 M Fe(NO,)3 in 0.10 M HNO, mL…
A:
Q: A spectrophotometric method for the quantitative analysis of Pb2+ in blood has a normal calibration…
A: Given that the normal calibration equation is Sstd = (0.296 ppb-1) Cstd+0.003.
Q: The Ksp of Mg(OH)2 is 5.61 x 10-12, If you tried to dissolve 24.0 mg of Mg(OH)2 in 250 mL of wąter…
A: I think your question is incorrect. It should be ask the amount of dissolved solid according to…
Q: 1- What term refers to the ability to distinguish two peaks from one another in a chromatogram? two…
A: Chromatography is a technique used to seperate components from a mixture. Here we have to answer…
A second spectrophotometric method for the quantitative analysis of Pb2+ in blood yields an Ssamp of 0.712 for a 5.00 mL sample of blood. After spiking the blood sample with 5.00 μL of a 1560 ppb Pb2+ external standard, an Sspike of 1.546 is measured. What is the concentration of Pb2+ in the original sample of blood?
Trending now
This is a popular solution!
Step by step
Solved in 6 steps with 6 images
- To determine the molar concentration of a metal ion in a solution of unknown concentration, a student fırst made five standard solutions that contain the metal ion of interest and measured the absorbance of each solution in a spectrophotometer at its Amax- A calibration curve was obtained that had an equation of y = 5.747 x + 0.013 Next, the student pipetted 15.0 mL of the initial solution of unknown concentration into a 100.0 mL volumetric flask, and filled the flask with deionized water to the line. The absorbance of this final diluted solution was found to be A = 0.226 at Amax. The color of the original and diluted solution was blue. What is the molarity of the original solution, as well as an approximate Amax for this metal ion? 2max = 599 nm and concentration is 0.247 M Amax 457 nm and concentration is 0.247 M %3D 2 max = 457 nm and concentration is 0.0371 M 1 max 599 nm and concentration is 0.0371 M Amax = 599 nm and concentration is 0.00557 MA 10.00 mL of natural water sample containing Ni2+ was pipetted into a volumetric flask and diluted to 50.00 mL with pure water. In the second 10.00 mL of natural water sample transferred into a volumetric flask, exactly 4.00 mL of a Ni2+ solution with a concentration of 5.99 mg/L was added and then diluted to 50.00 mL with pure water. The measured absorbance is A1= 0.436 and A2 = 0.663. What is the Ni2+ concentration in unit of mg/L in the natural water sample?4- A sample containing H2C204 had a purity equal to 90.50% (w/w). An unknown mass of this sample was dissolved in water and transferred to a 50.00 mL flask. An aliquot of 25.00 mL was transferred to an erlenmeyer flask and 50.00 mL of a 0.2000 mol L^-1 NaOH solution were added. %3 Excess NaOH was titrated with 0.09000 mol L^-1 HCI solution using 2.000 mL. Calculate the mass (g) of the sample used. Data: H = 1.008 C= 12.01 O = 16.00
- What are the differences between systematic and random errors and how do they effect accuracy and precision? In what circumstances would you use standard addition (versus a normal calibration curve) to determine the amount of an analyte in a sample? A urine sample, containing analyte Z is analysed by the standard addition method where 5 mL of the original sample was mixed with increasing amounts of a Z standard and each solution diluted to a volume of 50 mL prior to analysis. A plot of the final concentration of the standard in each of the 50 mL samples (x axis) versus The measured signal from the analysis of each 50 mL sample (on y axis) produced a straight line with the general equation: y = 44.72x + 4.06 what was the final concentration of Z in the 50 mL standard addition sample? what was the initial concentration of Z in the original urine sample?A spectrophotometric method for the quantitative analysis of Pb2+ in blood has a normal calibration curve for which Sstd=(0.296 ppb−1)×Cstd+0.003. What is the concentration of Pb2+ in a sample of blood if Ssamp is 0.397?A controversy broke out as a dead body was found in a bar on Cornelia Street. The media revealed that minutes before the person died, he described his drink as something stronger than other drinks in the bar. You were the analyst tasked to verify the cause of death. Preliminary qualitative tests showed the possible presence of cyanide in the victim's death. Thus, you tried to quantitatively detect cyanide ions in the victim's drink using spectrophotometric analysis. Standard solutions were of different CN- concentrations were made as shown in Table 2. A 25.0mL aliquot of each standard solution was added with Fe(NO3)3 to form the colored complex, [Fe(CN)6]³ (aq). Each standard solution was then diluted to a total volume of 50.0 mL. The absorbances of the diluted standard solutions were recorded using 1.00-cm cells and at Amax = 725 nm and found in Table 2. Table 2. Raw absorbance measurements for each standard solution of CN-. [CN-] prior to dilution, M Abs@725nm 0.002 0.000 0.040 0.160…
- 2+ as (6) A sample of an ore was analyzed for Cu* follows. A 1.25 g sample of the ore was dissolved in acid and diluted to volume in a 250 mL volumetric flask. A 20 mL portion of the resulting solution was transferred by pipet to a 50 ml volumetric flask and diluted to volume. An analysis showed that the concentration of 2+ Cu* in the final solution was 4.62 ppm. What is the weight percent of Cu in the original ore?The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance was too high. The sample was then diluted by using a pipette to take 100.0 μLμL of the sample and injecting it into a cuvette already containing 2.00 mLmL of water (total volume is 2.00 mLmL + 100.0 μLμL). The absorbance value of the diluted solution corresponded to a concentration of 7.71×10−6 M M . What was the concentration of the original solution? Express the concentration to three significant figures with the appropriate units.You are preparing a 100.0 mL standard solution needed for titration analysis. The NaOH (40 g/mol) pellets are measured to be 0.5341 g in a balance with acceptable uncertainty of +0.001 g. Mass of the pellets is recorded after taring the container. The pellets are put in a beaker and added with 50 ml distilled water measured by a graduated cylinder. The solution is then quantitatively transferred to a 100-mL volumetric flask with uncertainty of ±0.08 mL and diluted to a 100-mL mark. What is the concentration (M) of the solution and estimate its uncertainty by propagation? Assumption: There is no uncertainty in molar mass. Express your answer as C+/- u M.
- You begin preparation of the calibration curve to measure absorbance vs concentration of FeSCN2+. To do so, you add 2.422 mL of 0.200 M Fe(NO3)3 to a cuvette and then directly add 215 µL of 0.001 M KSCN. What is the resulting concentration of FeSCN2*, assuming complete conversion of SCN' to FeSCN2+? Enter your answer in units of mM to four digits after the decimal.What are the advantages and disadvantages of volumetric and gravimetric analysis?Example: You wish to prepare a calibration curve for the spectrophotometric determination of permanganate. You have a stock 0.100 M solution of KMnO4 and a series of 100 mL volumetric flasks. What volumes of the stock solution will you have to pipet into the flasks to prepare standards of 1.00 x10³, 2.00 x10-³, 5.00 x103, and 10.0 x103 M KMnO4 solutions? Solution: for 1.00 x10-³ 0.1 (M1X V1)conc. = (M2 X V2) dil mmol |x V1 = 1.0 × 10-3 -) x 100 (ml) mL mmoly mL V₁= 1.0 mL stock solution. Take home work for the 2.00 x10-3, 5.00 x10³, and 10.0 x10-³ M.