2NaOH + H2SO4 = Na2SO4 + 2H2O
2Na[+] + 2OH[-] + 2H[+] + SO4[2-] = 2Na[+] + SO4[2-] + 2H2O
2H[+] + 2OH[-] = 2H2O
AlCl3+KNO3= \\\\
K2CO3 + H2SO4= K2SO4 + CO2↑ + H2O
2K[+] + CO3[2-] + 2H[+] + SO4 = 2K[+] + SO4[2-] + CO2↑ + H2O
2H[+] + CO3[2-] = CO2↑ + H2O