Chapter 16, Problem 16.68QP

Interpretation Introduction

Interpretation:

Which of the given salts that undergoes hydrolysis has to be specified

Concept Information:

• Salt hydrolysis is a reaction in which the ion of salt reacts with water and produce either hydronium ion or hydroxide ion.
• In other words, when an ionic compound bearing a weak base as its anion dissolved in water undergoes hydrolysis.  The weak base anion accepts a proton from water and produces its conjugate base and hydroxide ion.
• For Example: The dissociation of salt $\text{NaF}$ gives ${\text{Na}}^{\text{+}}$ and ${\text{F}}^{\text{-}}$ ions.  The ions of $\text{NaF}$ reacts with water and produce hydroxide ions, which affects the pH of the solution.

${\text{F}}^{-}{}_{(aq)}+{\text{H}}_{\text{2}}{\text{O}}_{(l)}\to {\text{HF}}_{(aq)}+{\text{OH}}^{\text{-}}{}_{(aq)}$

• In general, cations that are strong conjugate acids, anions that are strong conjugate bases, and small, highly charged metal ions will undergo hydrolysis.
• The extent of hydrolysis is depends on the charge and size of the metal cation.  The metal cations with small size and high charge show greatest extent of hydrolysis because compact, highly charged ion is more effective in polarizing the  $\text{OH}$  bond and facilitates ionization.
• If the anion of salt forms weak acid, then hydrolysis takes place

To Specify: if the given salts undergoes hydrolysis or not.