Question

2) Which one of the following pairs cannot be mixed together to form a buffer solution? 2) A) NaC2H302, HCI (C2H302" = acetate) B) H3P04, KH2P04 C) N H3, N H4CI D) Rb0 H, HBr E) КОН, НЕ

Answer 1

According to the definition of the buffer solution we get,

the buffer solution is made by mixing the weak acid and solution of its salt with a strong base or by mixing a weak base with the solution of its salt with strong acid.

Now, analyzing the options:

Option (A) can't be used as the buffer, as NaC₂H₃O₂ and HCl are not satisfying the conditions of the buffer, i.e NaC₂H₃O₂ is the salt of C₂H₄O₂ but not HCl. Hence, they cannot form a buffer solution.

Option (B) can be used as the buffer, as H₃PO₄ and KH₂PO₄ are satisfying the conditions of the buffer, i.e KH₂PO₄ the salt of H₃PO₄ formed with strong base i.e KOH.

Option (C) can be used as the buffer, as NH₃and NH₄Cl are satisfying the conditions of the buffer, i.e NH₄Cl is the salt of NH₃ formed with a strong acid i.e HCl.'

Option (D) can't be used as the buffer, as RbOH and HBr are not satisfying the conditions of the buffer, i.e RbOHis a base and HBr is an acid. Hence, they cannot form a buffer solution.

Similar to Option (D), Option (E) can't be used as the buffer, as KOH and HF are not satisfying the conditions of the buffer, i.e KOHis a base and HF is an acid. Hence, they cannot form a buffer solution.

Hope this helps!