1. Standardize the sodium thiosulfate solution. This is done by reacting a known amount of potassium iodate with a known amount of sodium thiosulfate. The endpoint of the reaction is reached when the solution turns colorless.
2. Calculate the molarity of the sodium thiosulfate solution. Use the following formula:
```
Molarity of sodium thiosulfate = moles of potassium iodate / liters of sodium thiosulfate
```
3. React the potassium iodate solution with a known amount of the sodium thiosulfate solution. The endpoint of the reaction is reached when the solution turns colorless.
4. Calculate the moles of potassium iodate in the reaction. Use the following formula:
```
Moles of potassium iodate = liters of sodium thiosulfate * molarity of sodium thiosulfate
```
5. Calculate the molarity of the potassium iodate solution. Use the following formula:
```
Molarity of potassium iodate = moles of potassium iodate / liters of potassium iodate
```
Here is an example of how to calculate the molarity of potassium iodate in redox titration:
1. Standardize the sodium thiosulfate solution:
- Dissolve 0.1000 g of potassium iodate in 100 mL of water.
- Add 50 mL of 6 M sulfuric acid.
- Add 1 g of potassium iodide.
- Titrate the solution with 0.1 M sodium thiosulfate solution until the solution turns colorless. The endpoint of the reaction is reached after 15.00 mL of sodium thiosulfate solution has been added.
2. Calculate the molarity of the sodium thiosulfate solution:
```
Molarity of sodium thiosulfate = (0.1000 g / 214.01 g/mol) = 0.0004612 M
```
3. React the potassium iodate solution with a known amount of the sodium thiosulfate solution:
- Pipette 50 mL of the potassium iodate solution into a flask.
- Add 50 mL of 6 M sulfuric acid.
- Add 1 g of potassium iodide.
- Titrate the solution with 0.1 M sodium thiosulfate solution until the solution turns colorless. The endpoint of the reaction is reached after 25.00 mL of sodium thiosulfate solution has been added.
4. Calculate the moles of potassium iodate in the reaction:
```
Moles of potassium iodate = 25.00 mL * 0.0004612 M
= 0.001153 mole
```
5. Calculate the molarity of the potassium iodate solution:
```
Molarity of potassium iodate = 0.001153 mol/0.0500 L = 0.02306 M
```
Therefore, the molarity of the potassium iodate solution is 0.02306 M.
