Write an experiment for class 9 on the preparation of a true solution of common salt, sugar and alchohol.

Sure, here is a step-by-step guide to perform an experiment on the preparation of a true solution of common salt, sugar, and alcohol.

Materials Needed:

1. Common salt (sodium chloride)
2. Sugar (sucrose)
3. Alcohol (ethanol)
4. Distilled water
5. Three beakers
6. Stirring rod
7. Weighing scale

Procedure:

1. Start by cleaning the three beakers to ensure they are free from any impurities.
2. Weigh 10 grams each of common salt and sugar using the weighing scale.
3. Pour 100 ml of distilled water into each of the two beakers.
4. Add the weighed common salt into the first beaker containing water and stir it using the stirring rod until the salt completely dissolves. This is your salt solution.
5. Repeat the same process with sugar in the second beaker. This is your sugar solution.
6. For the alcohol solution, pour 10 ml of alcohol into the third beaker containing 90 ml of water and stir.
7. Observe the three solutions. You will notice that all the solutes (salt, sugar, and alcohol) have completely dissolved in the water, indicating that they are true solutions.

Note: Always remember to follow safety guidelines while performing experiments. Wear protective eyewear and gloves, and do not ingest any of the substances used in the experiment.