CH3COOH and CH3COONa\mathrm{CH}_{3} \mathrm{COOH} \text { and } \mathrm{CH}_{3} \mathrm{COONa}CH3COOH and CH3COONa
NaOH and NaCl \text {NaOH and NaCl}NaOH and NaCl
Na2SO4 and H2SO4\mathrm{Na}_{2} \mathrm{SO}_{4} \text { and } \mathrm{H}_{2} \mathrm{SO}_{4}Na2SO4 and H2SO4
NH4Cl and NH4OH\mathrm{NH}_{4} \mathrm{Cl} \text { and } \mathrm{NH}_{4} \mathrm{OH}NH4Cl and NH4OH