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The equilibrium dissociation of the weak acid can berepresented as:
HA (aq) + H2O (l) H3O+(aq) + A- (aq)
[HA]initial= 0.080 M
Percent ionization = 2.3 %
Percent ionization = [H3O+] /[HA]initial * 100
2.3 % = ([H3O+]/0.080 M) *100
[H3O+] = 0.00184 M
Ka= [H3O+][A-] / [HA]
HA (aq) + H2O (l) H3O+ (aq) + A- (aq)
Initial 0.080M - 0 0
Change (0.080 -0.00184) +0.00184 + 0.00184
Equilibrium 0.07816M 0.00184 M 0.00184M
Ka = [H3O+][A-] /[HA]
=( 0.00184 )2 / (0.07816)
= 4.3 * 10-5
pKa = -logKa
= - log(4.3 *10-5)
=4.37
pKa = -logKa
= - log(4.3 *10-5)
=4.37
Solution
The equilibrium dissociation of the weak acid can berepresented as:
HA (aq) + H2O (l) H3O+(aq) + A- (aq)
[HA]initial= 0.080 M
Percent ionization = 2.3 %
Percent ionization = [H3O+] /[HA]initial * 100
2.3 % = ([H3O+]/0.080 M) *100
[H3O+] = 0.00184 M
Ka= [H3O+][A-] / [HA]
HA (aq) + H2O (l) H3O+ (aq) + A- (aq)
Initial 0.080M - 0 0
Change (0.080 -0.00184) +0.00184 + 0.00184
Equilibrium 0.07816M 0.00184 M 0.00184M
Ka = [H3O+][A-] /[HA]
=( 0.00184 )2 / (0.07816)
= 4.3 * 10-5
pKa = -logKa
= - log(4.3 *10-5)
=4.37
pKa = -logKa
= - log(4.3 *10-5)
=4.37

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The equilibrium dissociation of the weak acid can berepresented as.pdf

  • 1. The equilibrium dissociation of the weak acid can berepresented as: HA (aq) + H2O (l) H3O+(aq) + A- (aq) [HA]initial= 0.080 M Percent ionization = 2.3 % Percent ionization = [H3O+] /[HA]initial * 100 2.3 % = ([H3O+]/0.080 M) *100 [H3O+] = 0.00184 M Ka= [H3O+][A-] / [HA] HA (aq) + H2O (l) H3O+ (aq) + A- (aq) Initial 0.080M - 0 0 Change (0.080 -0.00184) +0.00184 + 0.00184 Equilibrium 0.07816M 0.00184 M 0.00184M Ka = [H3O+][A-] /[HA] =( 0.00184 )2 / (0.07816) = 4.3 * 10-5 pKa = -logKa = - log(4.3 *10-5) =4.37 pKa = -logKa = - log(4.3 *10-5) =4.37 Solution The equilibrium dissociation of the weak acid can berepresented as: HA (aq) + H2O (l) H3O+(aq) + A- (aq) [HA]initial= 0.080 M Percent ionization = 2.3 % Percent ionization = [H3O+] /[HA]initial * 100 2.3 % = ([H3O+]/0.080 M) *100 [H3O+] = 0.00184 M Ka= [H3O+][A-] / [HA] HA (aq) + H2O (l) H3O+ (aq) + A- (aq)
  • 2. Initial 0.080M - 0 0 Change (0.080 -0.00184) +0.00184 + 0.00184 Equilibrium 0.07816M 0.00184 M 0.00184M Ka = [H3O+][A-] /[HA] =( 0.00184 )2 / (0.07816) = 4.3 * 10-5 pKa = -logKa = - log(4.3 *10-5) =4.37 pKa = -logKa = - log(4.3 *10-5) =4.37