Question & Answer: I. Standardization of KMNO4 solution Procedure: Add 0.010 g samples of sodium oxalate…..

I. Standardization of KMNO4 solution

Procedure:

Add 0.010 g samples of sodium oxalate (Na₂C₂O₄) to 3 separate Erlenmeyer flasks. In each flask put 30 mL DI H₂O, 1.0 mL 9 M sulfuric acid (H₂SO₄), and 2 drops of 0.1 M manganese (II) sulfate (MnSO₄). Use a graduated pipet with 0.02 M KMnO₄ to titrate each solution.

Mass Na₂C₂O₄– Sample 1: 0.010 g , Sample 2: 0.010 g , Sample 3: 0.010 g

Volume KMnO₄– Sample 1: 1.35 mL , Sample 2: 1.42 mL , Sample 3: 1.39 mL — this is the amount of KMnO₄that was used to turn solution a faint pink color

From this data:

*What is the molarity of KMnO₄ for sample 1?

*What is the molarity of KMnO₄ for sample 2?

*What is the molarity of KMnO₄ for sample 3?

*What is the average molarity of the KMnO₄ solution?

*Calculate the standard deviation of the molarity of the KMnO₄ solution.