Suppose in an experiment to determine the amount of sodium hypochlorite in bleach, 0.0000524 mol K I O 3 were titrated with an unknown solution of N a 2 S 2 O 3 and the endpoint was reached after 17.80 mL . How many moles of N a 2 S 2 O 3 did this require

The amount of sodium thiosulfate required is moles

Explanation:

Moles of solution given = 0.0000524 moles

The chemical equation for the reaction of potassium iodate and sodium thiosulfate follows:

By Stoichiometry of the reaction:

2 moles of potassium iodate reacts with 1 mole of sodium thiosulfate

So, 0.0000524 moles of potassium iodate will react with = of sodium thiosulfate

Hence, the amount of sodium thiosulfate required is moles

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