A certain weak acid, ha, has a ka value of 3.6*10-7. part a calculate the percent ionization of ha in a 0.10 m solution. express your answer to two significant figures and include the appropriate units. view available hint (s)

Question

Chemistry

Armando Gilbert

28 December, 22:30

A certain weak acid, ha, has a ka value of 3.6*10-7. part a calculate the percent ionization of ha in a 0.10 m solution. express your answer to two significant figures and include the appropriate units. view available hint (s)

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Answers (1)

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Campbell Kent · Answer 1

Answer is: the percent ionization is 0,19%.

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

Ka (HA) = 3,6·10⁻⁷.

c (HA) = 0,1 M.

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

[HA] = 0,1 M - x.

Ka = [H⁺] · [A⁻] / [HA].

0,00000036 = x² / 0,1 M - x.

Solve quadratic equation: x = 0,00019 M.

α = 0,00019 M : 0,1 M · 100% = 0,19%.