The pH of 0.5 M aqueous solution of H F K a = 2 × 1 0 - 4 is

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The pH of 0.5 M aqueous solution of

H F

(K_{a} = 2 \times 1 0^{- 4})

is

ChemistryIonic EquilibriumNEET

Options:

A 2
B 4
C 6
D 10

Solution:

2235 Upvotes Verified Answer

The correct answer is: 2

K_{a} = C α^{2}

2 \times 10^{4} = 0.5 \times α^{2}

α = 2 \times 10^{- 2}

∴ [H^{+}] = C α = 0.5 \times 2 \times 10^{- 2} = 10^{- 2}

p H = 2

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