Which pair of compounds will form a buffer in aqueous solution?
HCN and NaCN
HCl and NaOH
NaCN and NaOH
HCN and HCl
HCl and NaCl
NaCN and KCN
Homework Answers
The concept used to solve this problem is that a buffer is formed by the combination of a weak acid and its salt of a strong acid or by the combination of a weak base and its salt of strong acid.
A buffer solution is a solution that resists change in pH on addition of a strong base or a strong acid.
Buffer solutions are of 2 types:
1. Acidic buffer- This is formed by a weak acid and its salt of strong base.
2. Basic buffer- This is formed by a weak base and its salt of strong acid.
Part A
HCN is a weak acid and NaCN on the other hand is a salt of a weak acid HCN and a strong base NaOH.
Part B
HCl is a strong acid and NaOH on the other hand is a strong base.
Part C
NaOH is a strong base and NaCN on the other hand is a salt of a weak acid HCN and a strong base NaOH.
Part D
HCl is a strong acid and HCN on the other hand is a weak acid.
Part E
HCl is a strong acid and NaCl on the other hand is a salt of a strong acid HCl and a strong base NaOH.
Part F
NaCN is a salt of a strong base and weak acid and KCN on the other hand is also salt of a weak acid and a strong base.
Ans: Part AHCN and NaCN form a buffer in aqueous Solution.
Part BHCl and NaOH don’t form a buffer in aqueous Solution.
Part CNaOH and NaCN will not form a buffer in aqueous Solution.
Part DHCl and HCN don’t form a buffer in aqueous Solution.
Part EHCl and NaCl will not form a buffer in aqueous Solution.
Part FNaCN and KCN don’t form a buffer in aqueous Solution.
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PQ-25. An aqueous buffer solution contains only HCN (PK, = 9.31) and KCN and has a pH of 8.50. What can be concluded about the relative concentrations of HCN and KCN in the buffer? (A) [HCN]> [KCN] (B) [HCN]< [KCN] (C) [HCM] = [KCN] (D) nothing can be concluded about the relative concentrations
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