No, CH₃COONa (sodium acetate) is not an acid; it is a salt. It is formed from the neutralization of acetic acid (CH₃COOH) with sodium hydroxide (NaOH).
However, when dissolved in water, sodium acetate can create a basic solution. This happens because the acetate ion (CH₃COO⁻) reacts with water in a process called hydrolysis to form hydroxide ions (OH⁻), increasing the pH:
CH₃COO−+H2O→CH₃COOH+OH−
Thus, sodium acetate is a basic salt, not an acid.