A Solution of Potassium Permanganate Was Standardized by Titration of a Solution

question 82

Multiple Choice

A solution of potassium permanganate was standardized by titration of a solution prepared by dissolving 0.268 g of pure sodium oxalate in approximately 25 mL of distilled water. A 31.4 mL volume of titrant was required to reach the end-point. The reaction is: 2 MnO₄^- + 5 C₂O₄^2- + 16 H⁺ → 2 Mn²⁺ + 10 CO₂ + 8 H₂O.
What is the molarity of MnO₄^- ?

• A) 0.0174 M
• B) 0.0255 M
• C) 0.0348 M
• D) 0.0637 M
• E) 0.159 M

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Definitions:

Standard Deviation

A metric indicating the degree of spread or variability among values in a collection.

Variation

The occurrence of an organism, trait, or gene in more than one form, leading to diversity within a population.

Statistic

A numerical datum or piece of data derived from a study of a large quantity of numerical data, used for analyzing features of that population.

p < .05

A statistical term indicating that the probability of the observed data, or more extreme, under the null hypothesis is less than 5%, suggesting the results are statistically significant.