Concentration of a Solution is the amount of solute present in a solution

## Different Methods  to Calculate Concentration

• Mass by Mass %
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Concentration of Solution = (Mass of Solute / Mass of Solution) × 100

• Mass by Volume %
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Concentration of Solution = (Mass of Solute / Volume  of Solution) × 100

• Volume by Volume %
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Concentration of Solution = (Volume  of Solute / Volume  of Solution) × 100

Let's do Examples of each

## Mass by Mass %

Suppose 100 grams of salt is mixed in 400 grams of water

It forms 500 grams of solution

Concentration of Solution = Mass of Solute / Mass of Solution  × 100

= (100 / 500) × 100

= 20%

## Mass by Volume %

Calculate the concentration in terms of mass by volume percentage of the solution containing, 2.5g potassium chloride in 50ml of potassium chloride (KCl) solution?

Mass of Solute (Potassium Chloride) = 2.5 g

Volume of Solution = 50 mL

Concentration of Solution = Mass of Solute / Volume of Solution  × 100

= (2.5 / 50) × 100

= 5%

## Volume by Volume %

If 2 mL of acetone is present in 45 mL of its aqueous solution, calculate the concentration of this solution

Volume of Solute (Acetone) = 2 mL

Volume of Solution = 45 mL

Concentration of Solution = Volume of Solute / Volume of Solution  × 100

= (2 / 45) × 100

= 4.44 %

1. Class 9
2. Chapter 2 Class 9 - Is Matter Around Us Pure (Term 1)
3. Concepts

Concepts

Class 9
Chapter 2 Class 9 - Is Matter Around Us Pure (Term 1) 