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 all your apparatus to ensure they are free from any contaminants.
2. Weigh 10 grams of common salt using the weighing scale and put it in the first beaker.
3. Add 100 ml of distilled water to the beaker containing common salt.
4. Stir the solution using the stirring rod until the salt completely dissolves in the water. This is your true solution of common salt.
5. Repeat the same process with sugar. Weigh 10 grams of sugar and put it in the second beaker.
6. Add 100 ml of distilled water to the beaker containing sugar.
7. Stir the solution until the sugar completely dissolves in the water. This is your true solution of sugar.
8. For the alcohol, since it is already a liquid, you don't need to dissolve it. Measure 10 ml of alcohol and put it in the third beaker.
9. Add 90 ml of distilled water to the beaker containing alcohol.
10. Stir the solution. This is your true solution of alcohol.

Observation: You will notice that all the solutes (salt, sugar, and alcohol) completely dissolve in the solvent (water), forming a homogeneous mixture. This is a characteristic of a true solution.

Conclusion: A true solution is a homogeneous mixture of two or more substances where the solute completely dissolves in the solvent. In this experiment, we prepared true solutions of common salt, sugar, and alcohol.