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Question

Chemistry Question on Equilibrium

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

A

3.98×10−63.98 \times 10^{-6}

B

3.68×10−63.68 \times 10^{-6}

C

3.88×1063.88 \times 10^{6}

D

3.98×1083.98 \times 10^{8}

Answer

3.98×10−63.98 \times 10^{-6}

Explanation

Solution

pH=5.4 pH =5.4 ∴[H+]≈10−5.4=10−6⋅100.6\therefore\quad\left[H^{+}\right]\approx 10^{-5.4} = 10^{-6}\cdot10^{0.6} Antilog of 0.60.6 is ≈4\approx 4 ∴[H+]≈4×10−6 M\therefore\quad\quad\left[H^{+}\right]\approx 4\times 10^{-6} \,M