Write an equation for the reaction that takes place

Question

A buffer can be prepared using lactic acid [CH3CH(OH)CO2H] and its conjugate base, lactate ion [CH3CH(OH)CO2-].

a. when H₃O⁺ is added to this buffer.

b. when OH^- is added to this buffer.

Answer 1

When an acid (H₃O⁺) is added, it will react with the conjugate base.

When a base (OH^-) is added, it will react with the acid.

(a) H₃O⁺ + CH3CH(OH)CO2^- ==> CH3CH(OH)CO2H + H2O

(b) OH^- + CH3CH(OH)CO2H ==> CH3CH(OH)CO2^- + H2O