Prepare 250 cc n/10 KMno4 solution

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To prepare a 250 cc n/10 KMnO4 solution, you will need the following materials and equipment:

1. Potassium permanganate (KMnO4) powder
2. Distilled water
3. Beaker or volumetric flask
4. Measuring cylinder or pipette
5. Stirring rod or magnetic stirrer
6. Weighing scale or balance

Here are the steps to prepare the solution:

1. Calculate the amount of KMnO4 needed:
- n/10 solutions indicate the normality (n) of the solution and it is equal to the gram equivalent weight of the solute per liter of solution.
- The gram equivalent weight of KMnO4 is 158.04 g/mol, and since we need a 250 cc (or 0.25 L) solution, the amount of KMnO4 required can be calculated as follows:
- Amount of KMnO4 = n * Molar mass * Volume of solution
- Amount of KMnO4 = (1/10) * 158.04 g/mol * 0.25 L
- Amount of KMnO4 ≈ 3.952 g

2. Weigh the required amount of KMnO4 using a weighing scale or balance, ensuring accuracy.

3. Transfer the weighed KMnO4 powder into a beaker or volumetric flask.

4. Add distilled water to the beaker or volumetric flask and slowly dissolve the KMnO4 powder by stirring. You can use a stirring rod or a magnetic stirrer for this purpose.

5. Carefully add distilled water to the beaker or volumetric flask to make a total volume of 250 cc (or 0.25 L). Ensure that the KMnO4 powder is completely dissolved. If using a beaker, you can use a measuring cylinder to measure and transfer the distilled water. If using a volumetric flask, fill it up to the mark with distilled water.

6. Stir the solution again to ensure thorough mixing.

You have now prepared a 250 cc n/10 KMnO4 solution. Remember to label the container properly and store it in a secure place.