Sodium acetate is a strong electrolyte, which is completely ionized in water: naac-na+? + ? AC^-？ ( 1)
Water is a weak electrolyte, partially ionized: H2O = reversible = H^+? + ? OH^- (2)
Ionization in the formula (1)? Ionization in AC^- and ②? H+ reaction generates weak acid HAC.
AC^-？ + ? H^+？ = reversible =? Honourable Artillery Company
[OH-] in the solution is greater than [H+], and the solution is weakly alkaline.
Sodium acetate hydrolysis:? AC^-？ + ? H2O？ = reversible =? HAC？ + ? OH^-
Adding a small amount of glacial acetic acid to sodium acetate solution can inhibit the hydrolysis of sodium acetate.
Glacial acetic acid is a weak acid, partially ionized: HAC? = reversible =? AC^-？ + ? H^+
Due to the same ion effect, HAC is ionized? AC^- shifts the equilibrium of formula (1) to the left, and ionized h+ shifts the equilibrium of formula (2) to the left, further inhibiting the hydrolysis of sodium acetate.