
(a)
Interpretation :
The value of Ka of HF must be determined.
Concept Introduction :
Acid dissociation constant (Ka) is small for weak acid. It is the ratio of concentration of products to reactants.
For a weak acid HA, Ka can be written as
(a)

Answer to Problem 4E
Ka for HF is
Explanation of Solution
b)
Interpretation :
The value of Ka for HNO3 is large must be shown.
Concept Introduction :
Strong acid undergoes complete dissociation.
b)

Answer to Problem 4E
The Ka of HNO3 is infinite.
Explanation of Solution
c)
Interpretation :
The stronger acid from HF or HNO3 must be determined.
Concept Introduction :
A strong acid undergoes complete dissociation whereas a weak acid undergo partial dissociation.
c)

Answer to Problem 4E
HNO3 is stronger acid.
Explanation of Solution
HNO3 has acid dissociation constant very large which is infinite.
HF is weaker acid as acid dissociation constant is very less which is
d)
Interpretation :
The solution with higher concentration of H+(aq) 0.10 M HF or 0.10 M HOCl must be explained.
Concept Introduction :
An acid will produce more H+ in aqueous solution which has greater Ka value.
d)

Answer to Problem 4E
0.10 M HF solution has higher concentration of H+(aq).
Explanation of Solution
HF has acid dissociation constant
HOCl has acid dissociation constant
Thus HF will furnish more H+ in aqueous solution.
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