NaOH,Na2CO3,NH4Cl,CH3COOH\mathrm{NaOH}, \mathrm{Na}_{2} \mathrm{CO}_{3}, \mathrm{NH}_{4} \mathrm{Cl}, \mathrm{CH}_{3} \mathrm{COOH}NaOH,Na2CO3,NH4Cl,CH3COOH
Na2CO3,NH4Cl,CH3COOH,NaOH\mathrm{Na}_{2} \mathrm{CO}_{3}, \mathrm{NH}_{4} \mathrm{Cl}, \mathrm{CH}_{3} \mathrm{COOH}, \mathrm{NaOH}Na2CO3,NH4Cl,CH3COOH,NaOH
NH4Cl,CH3COOH,NaOH,Na2CO3\mathrm{NH}_{4} \mathrm{Cl}, \mathrm{CH}_{3} \mathrm{COOH}, \mathrm{NaOH}, \mathrm{Na}_{2} \mathrm{CO}_{3}NH4Cl,CH3COOH,NaOH,Na2CO3
CH3COOH,NH4Cl,Na2CO3,NaOH\mathrm{CH}_{3} \mathrm{COOH}, \mathrm{NH}_{4} \mathrm{Cl}, \mathrm{Na}_{2} \mathrm{CO}_{3}, \mathrm{NaOH}CH3COOH,NH4Cl,Na2CO3,NaOH