Class 9 Chemistry Is Matter Around Us Pure Concentration of a Solution

Concentration of a Solution

  • At any particular temperature, a solution that has dissolved as much solute as it is capable of dissolving is said to be a saturated solution.
    • In other words, when no more solute can be dissolved in a solution at a given temperature, it is called a saturated solution.
  • If a saturated solution at a particular temperature is heated to a higher temperature, then it becomes unsaturated.
  • The amount of the solute present in the saturated solution at this temperature is called its
  • If the amount of solute contained in a solution is less than the saturation level, it is called an unsaturated solution.
  • The concentration of a solution is the amount of solute present in a given quantity of the solution.
  • The amount of solute dissolved in a given mass or volume of solvent.
    • Concentration of solution = (Amount of solute)/ (Amount of solution)

Or (Amount of solute)/ (Amount of solvent)

Problem 1:-

A solution contains 40 g of common salt in 320 g of water. Calculate the concentration in terms of mass by mass percentage of the solution

Answer 1:-

Mass of solute (salt) = 40 g

Mass of solvent (water) = 320 g

Also, Mass of solution = Mass of solute + Mass of solvent

= (40 g + 320 g)

= 360 g

Mass percentage of solution

= [(Mass of solute)/ (Mass of solution)] ×100

= (40/360) ×100 =11.1%

Solubility

  • The maximum amount of a solute which can be dissolved in 100gms of a solvent at a specified temperature is known as solubility of that solute in that solvent (at that temperature).

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