Concept explainers
Determine the pH of (a) a
Interpretation:
The
Concept introduction:
The
measures the concentration of hydronium ions in a solution. The solution with high concentration of hydronium ions has a low
The
The ionization of the weak acid takes place as:
Answer to Problem 5QP
Solution:
a)
b)
Explanation of Solution
a)
Summarize the concentration at equilibrium as follows.
Consider
The equilibrium expression for a reaction is written as follows:
Here,
is the concentration of acetate ion,
is the concentration of acetic acid, and
Substitute the value of
value of
The value of
Concentration of
The
Substitute the value of
Hence, the
b) A solution that is
The acetate ions are formed from sodium acetate on dilution and from acetic acid by ionisation.
The equation for the ionisation of sodium acetate ion is as follows:
Here, acetate ion is formed on dilution in the solution. So, the concentration of the acetate ion from sodium acetate is 0.2 M and the sodium ion further does not take part in the reaction.
Summarize the concentration at equilibrium as follows:
Consider
The equilibrium expression for a reaction is written as:
Here,
Substitute the value of
value of
The value of
Concentration of
The
Substitute the value of
Hence, the
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