NH4Cl + NaOH = NH3 ↑ + H2O + NaCl2NH3 + H2SO4 = (NH4)2SO4(NH4)2SO4 + Ba(NO3)2 = BaSO4 ↓ + 2NH4NO32NH4[+] + SO4[2-] + Ba[2+] + 2NO3[-] = BaSO4 ↓ + 2NH4[+] + 2NO3[-]SO4[2-] + Ba[2+] = BaSO4 ↓