3 23A 0.20 g sample of primary standard Na2C204 (134 g/mol) needed 37.22 mL of of KMN04solution to reach the end point. What is the molarity of KMNO4 reagent1.O a. 0.016 MOb. 0.055 MOc 0.008 MOd. 0.100MStandard solutions of most reductants are used in back titration because.2a.Their reactions with the analyte are very slowb. The endpoints can't be detectedThey undergo reaction with atmospheric oxygend. All of the aboveWhich of the following statements is incorrecta. A primary-standard grade salt of cerium(IV) is availableb. cerium (IV) solutions decomse slowly thus require occasional restandardization.c. Solutions of cerium (IV) in sulfuric acid are more stable than those of KMNO,. KMNO, solution is more widely used than cerium(IV) solution as an oxidizing agent.Which statement is correct when using bromine as an oxidantO a. Measured excess of standard bromate is added to the sample plus an excess ofpotassium bromide, excess bromine is titrated with Iodide ionOb.Excess of potassium bromide is added to the sample, excess bromide is titrated withlodide ionO C. Excess of standard bromate is added to the solution, then excess bromate is determinedby its titration against Iodide ionExcess of standard bromate is added to the solution, then excess bromate is determinedby its titration against lodide ion

1) Mass of Na2C2O4 = 0.2g Molar mass of Na2C2O4 = 134g/mol Volume of KMnO4 = 37.22ml Molarity of…

23A 0.20 g sample of primary standard Na2C204 (134 g/mol) needed 37.22 mL of of KMNO4 solution to reach the end point. What is the molarity of KMN04 reagent 1. O a. 0.016 M Ob. 0.055 M Oc 0.008 M O d. 0.100 M Standard solutions of most reductants are used in back titration because. 2 a. Their reactions with the analyte are very slow b. The endpoints can't be detected C They undergo reaction with atmospheric oxygen d. All of the above Which of the following statements is incorrect a. A primary-standard grade salt of cerium(IV) is available b. cerium (IV) solutions decompe slowly thus require occasional restandardization. C. Solutions of cerium (IV) in sulfuric acid are more stable than those of KMNO, d. KMNO, solution is more widely used than cerium(IV) solution as an oxidizing agent.

23A 0.20 g sample of primary standard Na2C204 (134 g/mol) needed 37.22 mL of of KMNO4 solution to reach the end point. What is the molarity of KMN04 reagent 1. O a. 0.016 M Ob. 0.055 M Oc 0.008 M O d. 0.100 M Standard solutions of most reductants are used in back titration because. 2 a. Their reactions with the analyte are very slow b. The endpoints can't be detected C They undergo reaction with atmospheric oxygen d. All of the above Which of the following statements is incorrect a. A primary-standard grade salt of cerium(IV) is available b. cerium (IV) solutions decompe slowly thus require occasional restandardization. C. Solutions of cerium (IV) in sulfuric acid are more stable than those of KMNO, d. KMNO, solution is more widely used than cerium(IV) solution as an oxidizing agent.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter13: Titrations In Analytical Chemistry

Section: Chapter Questions

Problem 13.28QAP

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