The hydrogen ion concentration in 0.2 M ethanoic acid ( K a = 2 × 1 0 - 5 m o l d m - 3 ) is

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The hydrogen ion concentration in 0.2 M ethanoic acid

(K_{a} = 2 \times 1 0^{- 5} m o l d m^{- 3})

is

ChemistryIonic EquilibriumNEET

Options:

A $2 \times 1 0^{- 2}$
B $2 \times 1 0^{- 4}$
C $2 \times 1 0^{- 3}$
D $2 \times 1 0^{- 5}$

Solution:

1031 Upvotes Verified Answer

The correct answer is:

2 \times 1 0^{- 3}

For weak acid

[H^{+}] = \sqrt{K_{a} . C}

= \sqrt{2 \times 10^{- 5} \times 0.2}

= 2 \times 10^{- 3}

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