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Question

What is meant by the concentration of a solution? Explain by giving an example.

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Solution

The concentration of a solution Is the amount of solute present in a given amount of solution or solvent. This can be mathematically written as:
The concentration of solution =Amount of soluteAmountofsolution
Or
The concentration of solution =Amount of soluteAmount of solvent
Mainly one expresses concentration in 2 ways:
(a) Mass by mass percentage:
Mass of solute Mass by mass percentage of a solution =Mass of soluteMass of solution×100
(b) Mass by volume percentage:
Mass of solute Mass by volume percentage of a solution
=Mass of soluteVolume of solution×100
Eg: Consider 30g of sugar (solute) dissolved in 150g of water (solvent).
Then the mass of solute =30g
Mass of solvent =150g
Mass of solution = Mass of solute • mass of solvent
=30+150
=180g
Therefore. the concentration of solute expressed using mass by mass percentage is:
Mass by mass percentage of solution = (Mass of solute/Mass of solution) ×100
=(30180)×100
=(16)×100
=16.6%

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