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To prepare a saturated solution of potassium nitrate at 25 degrees Celsius, you can follow these steps:
1. Measure out a quantity of potassium nitrate that is greater than the amount needed to saturate the solution. This is because some of the potassium nitrate will remain undissolved in the solution.
2. Place the potassium nitrate in a clean and dry glass container.
3. Add a small amount of water to the container, and stir the mixture until the potassium nitrate is completely dissolved. This creates a concentrated solution of potassium nitrate.
4. Continue adding small amounts of water to the mixture while stirring, until no more potassium nitrate can dissolve. This indicates that the solution is saturated.
5. Allow the solution to cool to room temperature (25 degrees Celsius) while stirring occasionally. This ensures that the potassium nitrate remains dissolved in the solution.
6. If any undissolved potassium nitrate is present, filter the solution through a filter paper to remove it.
7. The resulting solution is now a saturated solution of potassium nitrate at 25 degrees Celsius.
Note: The solubility of potassium nitrate increases with temperature. Therefore, if you heat the solution, more potassium nitrate can dissolve, resulting in a more concentrated solution.