tolong dijawab yaa terimakasih :)

pH = - log H+
5 = - log H+
H+ = 10^-5

H+ = Ka x mol asam / mol garam
10^-5 = 10^-5 x 0.3 mol / mol garam
mol garam = 0.3 mol
massa CH3COONa = 0.3 mol x 82 gr/mol
massa CH3COONa = 24.6 gr