### Theory:

Solutions: A solution is a mixture of two or more substances that appears to be uniform in appearance. A solution is a homogeneous mixture of two or more substances. Solutions
A solution is a mixture in which one substance dissolves fully in the other.

A solute is a part of a solution that is present in a smaller quantity by weight. A solvent is a variable that is present in a greater quantity by weight.

If we add the solvent and solute, we get the solution.

Solution $$=$$ Solvent $$+$$ Solute. Formation of solution

Types of solutions based on the size of solute particle:
• True solution
• Colloidal solution
• Suspensions
Example:
Let us look at the activity to find out the type of solution:

Activity 1: To find a true solution

Step 1: Add one spoon of sugar or salt to a glass full of water and stir it well.

Step 2: Keep it aside for $$10$$ minutes. Salt mixed with water

Observation: We can observe that we get a clear solution and the particles never settle down.

Result: The observed solution is known as the true solution.

Activity 2: To find a colloidal solution

Step1: Add one spoon of starch or chalk to a glass full of water and stir it well.

Step 2: Keep it aside for $$10$$ minutes. Chalk mixed with water

Observation: We can observe a cloudy mixture.

Result:
The observed solution is known as a colloidal solution.

Activity 3: To find a suspension solution

Step1: Add one spoon of wheat flour to a glass full of water and stir it well.

Step 2:
Keep it aside for $$10$$ minutes. Wheat flour mixed with water

Observation: We can observe that we get a turbid mixture and small particles sink at the bottom after some time.

Result: The observed mixture is called suspension.
Note:
True solution: The particle size is less than $$10^-7$$ cm.
Colloidal solution: The particle size is between $$10^-7$$ cm and $$10^-5$$ cm.
Suspension: The particle size is greater than $$10^-5$$ cm.