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1. In an experiment to standardize sodium thiosulfate, potassium iodate was used as a primary standard. 0.715 g of potassium iodate was dried in an oven and makeup to 200.0 mL with distilled water in a volumetric flask. Calculate the molarity of the potassium iodate primary standard. [6 points] 2. The potassium iodate in problem 1 was used to titrate against sodium thiosulfate. To perform the titration, 25.0 mL of potassium iodate solution was pipetted into an Erlenmeyer flask to which 10.0 mL of 10% sulfuric acid and 2.00 g of KI was added. 25.0 mL of potassium iodate with the same concentration as in problem 1 required 22.15 mL of sodium thiosulfate. (a) Write a balanced redox reaction for the reaction between the iodate ion and the thiosulfate ion. [3 points] (b) What is the exact molarity of sodium thiosulfate solution? [6 points]

          1. In an experiment to standardize sodium thiosulfate, potassium iodate was used as a primary standard. 0.715 g of potassium iodate was dried in an oven and makeup to 200.0 mL with distilled water in a volumetric flask. Calculate the molarity of the potassium iodate primary standard. [6 points]

2. The potassium iodate in problem 1 was used to titrate against sodium thiosulfate. To perform the titration, 25.0 mL of potassium iodate solution was pipetted into an Erlenmeyer flask to which 10.0 mL of 10% sulfuric acid and 2.00 g of KI was added. 25.0 mL of potassium iodate with the same concentration as in problem 1 required 22.15 mL of sodium thiosulfate.

(a) Write a balanced redox reaction for the reaction between the iodate ion and the thiosulfate ion. [3 points]

(b) What is the exact molarity of sodium thiosulfate solution? [6 points]

1. In an experiment to standardize sodium thiosulfate, potassium iodate was used as a primary standard. 0.715 g of potassium iodate was dried in an oven and makeup to 200.0 mL with distilled water in a volumetric flask. Calculate the molarity of the potassium iodate primary standard. [6 points]

2. The potassium iodate in problem 1 was used to titrate against sodium thiosulfate. To perform the titration, 25.0 mL of potassium iodate solution was pipetted into an Erlenmeyer flask to which 10.0 mL of 10% sulfuric acid and 2.00 g of KI was added. 25.0 mL of potassium iodate with the same concentration as in problem 1 required 22.15 mL of sodium thiosulfate.

(a) Write a balanced redox reaction for the reaction between the iodate ion and the thiosulfate ion. [3 points]

(b) What is the exact molarity of sodium thiosulfate solution? [6 points]

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