What is the ph of a 0.0055 m ha (weak acid) solution that is 8.2% ionized?

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Chemistry

Fellow

15 April, 01:14

What is the ph of a 0.0055 m ha (weak acid) solution that is 8.2% ionized?

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Marquise Haney · Answer 1

Answer is: pH value of weak is 3.35.

Chemical reaction (dissociation) : HA (aq) → H⁺ (aq) + A⁻ (aq).

c (HA) = 0.0055 M.

α = 8.2% : 100% = 0.082.

[H⁺] = c (HA) · α.

[H⁺] = 0.0055 M · 0.082.

[H⁺] = 0.000451 M.

pH = - log[H⁺].

pH = - log (0.000451 M).

pH = 3.35.

pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.