Exercise 5 Page 5 Illinois Central College CHEMISTRY 130 Laboratory Section: Name: PRELAB: Exp. 5 Chemical Stoichiometry: The Determination of Vitamin C. SHOW YOUR WORK 1. A 0.258 g sample of a powder containing some ascorbic acid required 14.50 mL of 0.100 M NaOH for complete neutralization. Calculate the purity of the ascorbic acid. moles of NaOH used in the titration moles of ascorbic acid reacted grams of ascorbic acid in sample Percent purity of the powder 2 A tablet of Vitamin C weighed 0.306 g and required 15.70 mL of 0.0300 M KIO, solution for oxidation to the blue starch-iodine endpoint. Calculate the percent ascorbic acid in the tablet. moles of KIO, used in the titration moles of ascorbic acid reacted grams of ascorbic acid in tablet Percent ascorbic acid in tablet

Exercise 5 Page 5 Illinois Central College CHEMISTRY 130 Laboratory Section: Name: PRELAB: Exp. 5 Chemical Stoichiometry: The Determination of Vitamin C. SHOW YOUR WORK 1. A 0.258 g sample of a powder containing some ascorbic acid required 14.50 mL of 0.100 M NaOH for complete neutralization. Calculate the purity of the ascorbic acid. moles of NaOH used in the titration moles of ascorbic acid reacted grams of ascorbic acid in sample Percent purity of the powder 2 A tablet of Vitamin C weighed 0.306 g and required 15.70 mL of 0.0300 M KIO, solution for oxidation to the blue starch-iodine endpoint. Calculate the percent ascorbic acid in the tablet. moles of KIO, used in the titration moles of ascorbic acid reacted grams of ascorbic acid in tablet Percent ascorbic acid in tablet

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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QUESTION 13 A solution has a hydronium ion concentration of 0.0078 M at 25 °C. What is its POH? O a. 4.85 O b. 16.11 O c. 2.11 O d. 11.89 O e. 9.15 QUESTION 14 What is the solubility product expression for Tb3(PO4)4? O a. Ksp = [Tb²+1³[PO4³-12 O b. Ksp =[3Tb3+][4P04³] OC. Ksp = =[3Tb3+1³[4PO43-14 O d. Ksp = = [Tb³+14 [PO44-13 Oe. Ksp = [Tb4+1³ [PO4³-14 Support ?
Question 3 What variable is correlated in the titration based on Nernst equation? Potential energy and Volume concentration and Enthalpy Enthalpy and Gibbs free Energy Concentration and potential energy
3 attempts left Check my work Be sure to answer all parts. Solid NaBr is slowly added to a solution that is 0.074 M in Cut and 0.074 M in Agt. Which compound will begin to precipitate first? CuBr AgBr What percent of Ag remains in solution at the point when CuBr just begins to precipitate?
28 Question The Ksp of barium fluoride is 1.00 x 10-6 The Ksp of calcium fluoride is 3.90 x 10-11 1st attempt See page 835 Jul See Periodic Table See Hint An aqueous solution of sodium fluoride is slowly added to a water sample that contains barium ion (4.00x10-2M) and calcium ion (3.75×10 2M). What is the remaining concentration of the first ion to precipitate when the second ion begins to precipitate? M
Answers: g CE Analysis of NH3 A 0.2502 g sample of the unknown chromium compound was dissolved in water, and 42.56 mL of 0.1089 M HCl was added, converting all the NH3 to NH4 with HCI left over. The excess HCI was titrated with 0.1022 M NaOH, requiring 10.28 mL Moles HCl added moles Moles NaOH added moles Moles HCI USED moles moles Moles NH3 Grams NH3 grams % % NH3
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QUESTION 13 If the peach sample contains other compounds with reducing property, what would be the effect on its ascorbic acid content determination? O Increase in ascorbic acid content Decrease in ascorbic acid content O No effect O No need for back-titration to be performed.
Question 8 Statement 1: Mohr titration is usually performed in an acidic medium. Statement 2: This is because under acidic conditions, the chromate ion is protonated to form chromic acid which leads to immediate precipitation at the end O Statement 1 is incorrect and Statement 2 is correct O Both statements are incorrect O Statement 1 is correct and Statement 2 is incorrect O Both statements are correct point.
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