A certain weak acid, ha, has a ka value of 7.1*10-7. part a calculate the percent ionization of ha in a 0.10 m solution.

Question

Chemistry

Marianna Pittman

9 April, 09:28

A certain weak acid, ha, has a ka value of 7.1*10-7. part a calculate the percent ionization of ha in a 0.10 m solution.

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Selah Lam · Answer 1

Answer is: the percent ionization of weak acid is 0.266%.

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

Ka (HA) = 7.1·10 ⁻⁷.

c (HA) = 0.10 M.

[H ⁺] = [A⁻] = x; equilibrium concentration.

[HA] = 0.10 M - x.

Ka = [H ⁺] · [A⁻] / [HA].

0,00000071 = x² / 0.1 M - x.

Solve quadratic equation: x = 0.000266 M.

α = 0.000266 : 0.1 M · 100% = 0.266%.