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.
 
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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.
 
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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.

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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.
 
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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.
 
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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.