The Ka of a monoprotic weak acid is 7 85 10 3 What is thepercent ion...

construct the ICE table lets mono protic acid is HA HA H2O H3O A ....

The Ka of a monoprotic weak acid is 7.85 Ã— 10-3. What is the percent ionization...

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Chemistry

The Ka of a monoprotic weak acid is 7.85 Ã— 10-3. What is thepercent ionization of a 0.136 M solution of this acid?

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construct the ICE table

lets mono protic acid is HA

Â Â Â Â Â Â Â Â HA + H2O <--------> H3O+ + A-

IÂ Â Â Â Â Â Â Â Â Â Â Â 0.136 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0 Â Â 0

CÂ Â Â Â Â Â Â Â Â Â Â Â Â -xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +x Â Â +x

EÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.136-xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +x Â Â +x

now write the dissociation expression

Ka = [H3O+][A-] / [HA]

7.85 Ã— 10^-3 = [x][x] / [0.136-x]

x² + x7.85 *10^-3 - 1.0676 * 10^-3 =0

solve the quadratic equation

x = 0.029 M = [H3O+]

percentage of ionisation

= concentration of [H3O+] / HA x 100

= 0.029 / 0.136 x 100

= 21.32 %

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The Ka of a monoprotic weak acid is 7.85 Ã— 10-3. What is the percent ionization...

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Chemistry

The Ka of a monoprotic weak acid is 7.85 Ã— 10-3. What is thepercent ionization of a 0.136 M solution of this acid?

Answer & Explanation Solved by verified expert

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