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

Different Methods  to Calculate Concentration

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

 

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

 

  • Volume by Volume %
    -
    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)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo