Hydrolizing salts?

Question

NaCl and Na2SO4 are non hydrolizing salts
NaCO3 and NaHCO3 are hydrolizing salts
the latter makes the pH higher in soils than the non hydrolizing ones.
Why is that?And where do those hydrolizing salts come from?

Answer 1

Non-hydrolyzing salts are formed from a strong acid with a strong base. These tend to be neutral, such as NaCl and Na2SO4.

Hydrolyzing salts are formed from a weak acid and a strong base and tend to be basic. The examples you give (Na2CO3 and NaHCO3) were formed from Carbonic acid which is very weak.

H2O + CO2 --> H2CO3