Respuesta :
Answer:
pH at the equivalence point for titration of HF and HCl will be basic and neutral respectively.
Explanation:
pH at equivalence point depends on hydrolysis equilibrium of conjugated base present in mixture.
[tex]\Rightarrow[/tex] Neutralization reaction: [tex]HF+OH^{-}\rightleftharpoons F^{-}+H_{2}O[/tex]
Hence, at equilibrium, [tex]F^{-}[/tex] is present in mixture.
Hydrolysis reaction: [tex]F^{-}+H_{2}O\rightleftharpoons HF+OH^{-}[/tex]
Here HF is an weak acid and [tex]OH^{-}[/tex] is a strong base, So, resultant pH of the solution will be basic.
[tex]\Rightarrow[/tex] Neutralization reaction: [tex]HCl+OH^{-}\rightleftharpoons Cl^{-}+H_{2}O[/tex]
Hence, at equilibrium, [tex]Cl^{-}[/tex] is present in mixture.
Hydrolysis reaction: [tex]Cl^{-}+H_{2}O\rightleftharpoons HCl+OH^{-}[/tex]
Here HCl is a strong acid and [tex]OH^{-}[/tex] is a strong base, So, resultant pH of the solution will be neutral.
