Experiment 23 Determination of by Redox Titration 7 (rev. 2150 Date Performed: P

Question

Experiment 23 Determination of by Redox Titration 7 (rev. 2150 Date Performed: Partner Name DATA & CALCULATIONS: A. Standardizing KMnos Solution. Sample 2 Sample Sodium oxalate standard solution prepared Mass of Na2C204 used Volume of Na2C204 solution prepared Molarity of Na2C204 solution Normality of Na2C204 solution Potassium permanganate stock solution standardized volume of Na20204 solution used in sample -20 o2 ga Volume of KMno4 solution used in titration Normality of KMno4 solution Average Normality of KMno4 solution Average Deviation Instructor's Grade for Precision in Part A Sample Calculations Part A

Explanation / Answer

V1 * N1 = V2 * N2

Given

Na2C2O4

Volume V1 = 20 ml

Normality N1 = 0.15 N

KMnO4

Trail 1

Volume V2 = 30 ml

Normality N2 =

20 ml * 0.15 N = 30 ml * N2

N2 = 0.1 N

Trail 2

Volume V2 = 29 ml

Normality N2 =

20 ml * 0.15 N = 29 ml * N2

N2 = 0.1034 N

Average normality = 0.1 + 0.1034 /2 = 0.1017 N

% deviation = sqrt ( (0.1-0.1017)2 + (0.1034- 0.1017)2 ) * 100 = 0.24 %

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