The density of a solution was determined experimentally. The results of three calculations are: 0.9975g/mL, 0.9986 g/mL & 0.9968g/mL. a.Determine the average density of the 3 runs. b.Determine the relative average deviation from the mean (rad) in ppt.
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- 4. A fat sample with combination of acids contain standard hydrochloric acid for blank and sample with 8mL and 5mL respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value.Table 1: Standardization Data Trial 1 Trial 2 O145504 Mass of KHP 04536 Initial burette reading 0.05ML 12.3 ML Final burette reading 12.8 a6.omL Volume of base used ר.12 13.2 mL Data Analysis: KH Cg Hg Da (MOIAR MASS 2041ag) 1. Calculate the molarity of base for each trial. You must use dimensional analysis – show all unit conversions (hint: start with grams of KHP used). Review the balanced equation for KHP and NaOH you wrote in Expt 11 part 1. (204.29 TRIAI 1: 0.4550g. Average: Trial 2: Trial 1: with 1875 mL of your base (use the averageChemistry help solve part d to h. the standard deviation is 0.0043m and the mean is 0.1052m.
- 1. Standardization of Sodium Hydroxide Primary Standard used: Formula Mass of Primary Standard: % Purity of Primary Standard: 99.0% Trials Actual weight of Std. KHP (g) 2 3 0.8074 0.8102 0.8378 Corrected weight of KHP (g) based on % purity of primary std. Calculation of required NaOH Balanced chemical equation: Dimensional analysis:7) The homogeneity of the chloride level in a water sample from a lake was tested by an analyst. Below are the concentration in parts per million (ppm) of Cl: 27.32, 27.22, 27.21, 27.24, 27.20 i. Determine the mean and median. ii. Calculate the confidence limit at 90%. iii. Identify a possible outlier and use the Q-test to determine whether it can be retained or rejected at 90% confidence levelThe distribution coefficient for Z between n-hexane and water is 5.85. What volume of n-hexane is required to decrease the concentration of Z to 1.00 x 10-5 M if 25.0 mL of 0.0200 M Z is extracted with a. 50.0-mL portions of n-hexane? Volume mL - b. 25.0-mL portions? Volume= = mL c. 10.0-mL portions? Volume: = mL
- 5. Which term is INCORRECTLY defined? a. linear range - the range over which the response of an analytical method is proportional to analyte concentration b. dynamic range concentration range over which there is a measurable response to analyte, though the response is not linear c. blank solution - a solution containing all reagents and solvents used in the analysis to which no analyte is deliberately added d. standard solutions - solutions for which the standard deviation is known - 6. True or False: Internal standards correct random error caused by run-to-run variation. a. True b. False4. Calculate the average and the standard deviation for the following data: Volume Water at 20°C, mL 27.25 27.15 26.87 26.65 27.55 5. How many grams of NaCl will you weigh out on the balance to prepare 100 mL of a 150 mM NaCl (MW = 58.5 g/mol) solution? 33percentage purity of an ibuprofen sample was determined by a reversed phase HPLC method as follows: Y Der ● A calibration curve of peak area versus concentration (ug/mL) of pure ibuprofen was constructed The ibuprofen sample for analysis was prepared by taking 10.0204 g of powder and dissolving it in/1Lbf distilled water (solution A). 1 ml of the latter solution was further diluted to IL with distilled water (solution B). Solution B was analysed by HPLC analysis Results The equation for the best-fit line of the calibration curve is: y=26820x-1323.8. ● The average peak area for the ibuprofen sample (solution B) was 266796.2 Calculate the percentage purity of the ibuprofen powder.
- 1. In a gravimetric analysis of a chloride salt, the following data were obtained. Mass of original chloride sample Mass of AgCl formed From the data, find the following: a. Mass of Cl in the original sample b. Percent CI in the sample c. Average % chloride d. Average deviation from the mean Trial 1 0.2674 0.4862 Trial 2 0.4219 0.8015 Trial 3 0.3612 0.61336. The concentration of caffeine in an energy soft drink was determined by standard addition using HPLC. The following procedure was used: a standard caffeine solution was prepared by adding 0.09850g of caffeine to 25.0 cm3 of water.A series of solutions were prepared by adding known volumes of the standard solution to the soft drink before diluting to 100 cm3. The volume of standard and the caffeine peak area are shown in the table: Energy Drink (cm3) Added caffeine Std (cm3) Peak area 15 0 965 15 5 1352 15 10 1739 15 15 2126 15 20 2513 Determine the concentration of caffeine in the soft drink as mg cm-3. A. 3.3 B. 2.3 C. 4.3 D. 7.3P TrueVision HD blackboard.uob.edu.bh/ultra/courses/ 19902 1/outline/assessment/ 452605 1/overview/e 1768814 1?cou Voitmeter e e salt bridge Fe KCI Cu FeSO4 CUSO,