Date Laboratory Instructor Unknown no, or comples REPORT SHEET EXPERIMENT Oxidat

Question

Date Laboratory Instructor Unknown no, or comples REPORT SHEET EXPERIMENT Oxidation-Reduction 37 Titrations I Determination of Oxalate B. Standardization of KMnO Mass of Na C20 Weighing bottle initial mass Weighing bottle final mass Mass of Na C204 Titration olume of KMnO Final reading Initial reading Volume of KMnO Calculations mMoles of Na C,04 Volume of KMno mMoles of KMnO Molarity of KMnO Trial 1 Trial 2 Trial 3 0.0 Average molarity_ See example 37.1 Standard deviation (show calculations) Copyright O 2015 Pearson Education, Inc.

Explanation / Answer

Trial 1

calculations:

a)

mmol of Na2C2O4 = mass/MW = 0.20/133.9985 = 0.00149

b)

Volume of KMnO4 = Vfinal - Vinitial = (30.7-0) = 30.7 mL = 30.7*10^-3 L

c)

mmol of KMnO4 = via ratio

5 mol of C2O4-2 = 2 mol of MnO4

mmol of MnO4 = MV = 2/5*0.00149 = 0.000596 mmol

d)

[KMnO4] = mmol /V = 0.000596/(30.7*10^-3) = 0.01941 M

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