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Question

(a) What do you mean by the concentration of a solution? Discuss any three methods of expressing the concentration of a solution.
(b) A solution contains 30 g of sugar dissolved in 300 g of water. Calculate the concentration of this solution.

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Solution

(a) Concentration of a solution is defined as the amount of solute that is present in a given amount of solution.
It can be expressed in terms of:
  • Mass by the mass percentage of a solution =mass of solutemass of solution×100
  • Mass by the volume percentage of a solution =mass of solutemass of solution×100
  • Volume by the volume percentage of a solution =volume of solutevolume of solution×100
(b) Mass of sugar (solute) = 30 g
Mass of water (solvent) = 300 g
So, the mass of solution = mass of solute + mass of solvent
= (30 + 300) g
= 330 g

Now, Mass by the mass percentage of a solution =mass of solutemass of solution×100
=30 g330 g×100
= 9.09 %

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