# JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Isohydric Solution

Isohydric Solution

Category : JEE Main & Advanced

If the concentration of the common ions in the solution of two electrolytes, for example ${{H}^{+}}$ ion concentration in $HCl$ and $HN{{O}_{3}}$ or $O{{H}^{-}}$ ion concentration in $Ca{{(OH)}_{2}}$ and $Ba{{(OH)}_{2}}$ is same, then on mixing them there is no change in the degree of dissociation of either of the electrolytes. Such solutions are called isohydric solutions.

Consider two isohydric solutions of acids $H{{A}_{1}}$ and$H{{A}_{2}}$. Let ${{V}_{1}}$ and ${{V}_{2}}$ be their dilutions and ${{\alpha }_{1}}$ and ${{\alpha }_{2}}$ be their degree of dissociation at the respective dilution. Then,

$\frac{{{\alpha }_{1}}}{{{V}_{1}}}=\frac{{{\alpha }_{2}}}{{{V}_{2}}}$

Above equation is useful for calculating the relative dilution of two acids at which they would be isohydric.

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