Question

Write the ways in which the concentration of a solution or the amount of substance present in its given volume can be expressed.

Answer 1

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1. $\text{\underline{\underline{Mass per cent}}}$ : It is defined as the percentage ratio of the mass of solute to the mass of solution.

Mass per cent = $\sf{{\dfrac{Mass \ of \ solute}{Mass \ of \ solution}}}$ × 100



2. $\text{\underline{\underline{Mole Fraction}}}$ : It is defined as the ratio of the number of moles of a particular component to the total number of moles of the solution.

It is denoted by x ( chi ).

x = $\sf{{\dfrac{No. \ of \ moles \ of \ a \ component}{Total \ moles \ of \ solution}}}$



3. $\text{\underline{\underline{Molarity}}}$ : It is defined as the ratio of number of moles of solute present in 1 L of solution.

It is denoted by M.

M = $\sf{{\dfrac{No. \ of \ moles \ of \ solute}{Volume \ of \ solution \ in \ litres}}}$



4. $\text{\underline{\underline{Molality}}}$ : It is defined as the number of moles of solute present in 1 kg of solvent.

It is denoted by m.

m = $\sf{{\dfrac{No. \ of \ moles \ of \ solute}{Mass \ of \ solvent \ in \ kg}}}$

Answer 2

It can be expressed in several ways: molarity (moles of solute per liter of solution); mole fraction, the ratio of the number of moles of solute to the total number of moles of substances present; mass percentage, the ratio of the mass of the solute to the mass of the solution times 100; parts per thousand (ppt), grams ..