Question

Predict whether the pHpH at the equivalence point for each titration will be acidic, basic, or neutral. Predict whether the at the equivalence point for each titration will be acidic, basic, or neutral. neutral for HFHF, and basic for HClHCl neutral for HClHCl, and basic for HFHF neutral for HFHF, and acidic for HClHCl neutral for HClHCl, and acidic for HFHF neutral for both

Answer 1

pH at the equivalence point for titration of HF and HCl will be basic and neutral respectively.

Step-by-step explanation:

pH at equivalence point depends on hydrolysis equilibrium of conjugated base present in mixture.

`\Rightarrow` Neutralization reaction:
`HF+OH^(-)\rightleftharpoons F^(-)+H_(2)O`

Hence, at equilibrium,
`F^(-)` is present in mixture.

Hydrolysis reaction:
`F^(-)+H_(2)O\rightleftharpoons HF+OH^(-)`

Here HF is an weak acid and
`OH^(-)` is a strong base, So, resultant pH of the solution will be basic.

`\Rightarrow` Neutralization reaction:
`HCl+OH^(-)\rightleftharpoons Cl^(-)+H_(2)O`

Hence, at equilibrium,
`Cl^(-)` is present in mixture.

Hydrolysis reaction:
`Cl^(-)+H_(2)O\rightleftharpoons HCl+OH^(-)`

Here HCl is a strong acid and
`OH^(-)` is a strong base, So, resultant pH of the solution will be neutral.