I. Standardization of KMNO4 solution
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.