Question

‘Hydrolysis of Salts and pH of Buffer Solutions’

- What is salt and how does the strength of acid and base affect the type of salt produced in their reaction?

- What happens when salt dissolves in water and what reaction occurs between salt ions and water?

- How are salt solutions categorized based on their pH?

- Why do these salts exhibit acidic, basic, or neutral pH properties in water?

- How can the pH property of salt solutions be predicted using the balanced net- ionic equation of hydrolysis reaction?
- What dissociation equilibrium expression is used when the salt is acidic? When the salt is basic? And, when the salt is neutral?

- What does the dissociation constant of salt solutions represent?

- What is a buffer and what is the purpose of using it in acid-base equilibrium reactions?

- How can buffers maintain the pH of aqueous solutions?

Answer 1

Ans 1 :

Salt is formed as the product of neutralisation reaction , when acid reacts with base.

The chemical nature of salt depends upon the acidity of the acid and base components. The strong acid and strong base reacts to form neutral salts , whereas strong acid reacts with weak base to form acidic salt. Likewise weak acid reacts with strong base to form basic salt.

For example : HCl + NaOH = NaCl + H2O

here NaCl is a neutral salt formed by strong acid HCl and strong base NaOH.