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  4. Hydrogen ion concentration in mol/L in a solution of pH = 5.4 will be :

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Q. Hydrogen ion concentration in mol/L in a solution of pH = 5.4 will be :

AIEEEAIEEE 2005Equilibrium

Solution:

$ pH =5.4$
$\therefore \quad\left[H^{+}\right]\approx 10^{-5.4} = 10^{-6}\cdot10^{0.6}$
Antilog of $0.6$ is $\approx 4$
$\therefore \quad\quad\left[H^{+}\right]\approx 4\times 10^{-6} \,M$