Concept explainers
Determine the percent ionization of the following solutions of formic acid at
Interpretation:
The percent ionization of the solution prepared by the dissolution of formic acid is to be determined.
Concept introduction:
The ionization of the weak acid takes place as:
Percent ionization is the percentage of acid that gets dissociated upon addition in water. It depends on the hydronium ion concentration.
Here,
Answer to Problem 57QP
Solution:
Explanation of Solution
Given information:
a)
Refer Table
When a weak acid is dissolved in water, only partial dissociation takes place into
The reaction of the weak acid
Prepare an equilibrium table and represent each species in terms of
Now, substitute these concentrations in equation (1) as:
Since the value of
Thus,
Calculate the percent dissociation from equation (2) as:
Since the percent dissociation is more than
The value of
Again, calculate the percent dissociation with this value as:
Therefore, the percent dissociation is
b)
Refer Table
When a weak acid is dissolved in water, only partial dissociation takes place into
The reaction of the weak acid
Prepare an equilibrium table and represent each species in terms of
Now, substitute these concentrations in equation (1) as:
The value of
The concentration cannot be negative. Thus,
Calculate the percent dissociation from equation (2) as:
Therefore, the percent dissociation is
c)
Refer Table
When a weak acid is dissolved in water, only partial dissociation takes place into
The reaction of the weak acid
Prepare an equilibrium table and represent each species in terms of
Now, substitute these concentrations in equation (1) as:
Since the value of
Thus,
Calculate the percent dissociation from equation (2) as:
Therefore, the percent dissociation is
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Chapter 16 Solutions
Aleks 360 2 Semester Access Card For Chemistry
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