Question

A certain weak acid, HA, has a *K*a value of
3.5×10^{−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.

**Part B**

Calculate the percent ionization of HA in a 0.010 *M*
solution.

Express your answer to two significant figures, and include the appropriate units.

Answer #1

A)

HA dissociates as:

HA -----> H+ + A-

0.1 0 0

0.1-x x x

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

Ka = x*x/(c-x)

Assuming x can be ignored as compared to c

So, above expression becomes

Ka = x*x/(c)

so, x = sqrt (Ka*c)

x = sqrt ((3.5*10^-7)*0.1) = 1.871*10^-4

since c is much greater than x, our assumption is correct

so, x = 1.871*10^-4 M

% dissociation = (x*100)/c

= 1.871*10^-4*100/0.1

= 0.1871 %

Answer: 0.18 %

B)

HA dissociates as:

HA -----> H+ + A-

1*10^-2 0 0

1*10^-2-x x x

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

Ka = x*x/(c-x)

Assuming x can be ignored as compared to c

So, above expression becomes

Ka = x*x/(c)

so, x = sqrt (Ka*c)

x = sqrt ((3.5*10^-7)*1*10^-2) = 5.916*10^-5

since c is much greater than x, our assumption is correct

so, x = 5.916*10^-5 M

% dissociation = (x*100)/c

= 5.916*10^-5*100/0.01

= 0.5916 %

Answer: 0.59 %

A certain weak acid, HA, has a Ka value of 7.4×10−7.
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. Part B Calculate
the percent ionization of HA in a 0.010 M solution. Express your
answer to two significant figures, and include the appropriate
units.

A certain weak acid, HA , has a Ka value of
6.6×10−7.
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.
Part B
Calculate the percent ionization of HA in a 0.010 M
solution.
Express your answer to two significant figures, and include the
appropriate units.

A certain weak acid, HA, has a Ka value of
1.4×10−7.
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.
Part B is calculate the percent ionization of HA in a 0.010 M
solution.

A certain weak acid, HA, has a Ka value of
1.6×10−7.
Part A
Calculate the percent ionization of HA in a 0.10 M
solution.
Express your answer as a percent using two significant
figures.
Part B
Calculate the percent ionization of HA in a 0.010 M
solution.
Express your answer as a percent using two significant
figures.

A certain weak acid, HA, has a Ka value of 6.9×10−7.
Part A Calculate the percent ionization of HA in a 0.10 M
solution. Express your answer as a percent using two significant
figures.
Part B Calculate the percent ionization of HA in a 0.010 M
solution. Express your answer as a percent using two significant
figures.

A certain weak acid, HA, has a Ka value of
6.9x10-7
1) Calculate the percent ionization of HA in a 0.10 M
solution
Express your answer to two significant figures and include the
appropriate units.
Value = Units =
2) Calculate the percent ionization of HA in a 0.010 M
solution
Value = Units =

A certain weak acid, HA, has a Ka value of 4.3×10−7.
Part A Calculate the percent ionization of HA
in a 0.10 M solution.
Part B Calculate
the percent ionization of HA in a 0.010 M solution.

A certain weak acid, HA, has a Ka value of 5.5×10−7.
Part A
Calculate the percent ionization of HA in a 0.10 M
solution.
Part B
Calculate the percent ionization of HA in a 0.010 M
solution.

A certain weak acid, HA, has a Ka value of
9.4×10−7.
Part A
Calculate the percent ionization of HA in a 0.10 M
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Part B
Calculate the percent ionization of HA in a 0.010 M
solution.

A certain weak acid, HA, has a Ka value of 5.7×10−7. Part A
Calculate the percent ionization of HA in a 0.10 M
solution.Calculate the percent ionization of HA in a 0.010
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