MgCO3->MgCl2->Mg(OH)2->MgO->Mg->MgCl2
MgCO3 + 2HCl = MgCl2 + H2O + CO2↑
MgCO3 + 2H[+] + 2Cl[-] = Mg[2+] + 2Cl[-] + H2O + CO2↑
MgCO3 + 2H[+] = Mg[2+] + H2O + CO2↑
MgCl2 + 2KOH = Mg(OH)2↓ + 2KCl
Mg[2+] + 2Cl[-] + 2K[+] + 2OH[-] = Mg(OH)2↓ + 2K[+] + 2Cl[-]
Mg[2+] 2OH[-] = Mg(OH)2↓
t
Mg(OH)2 ----------- > MgO + H2O
t
2MgO ----------- > 2Mg + O2
Mg + 2HCl = MgCl2 + H2↑
Mg + 2H[+] + 2Cl[-] = Mg[2+] + 2Cl[-] + H2↑
Mg + 2H[+] = Mg[2+] + H2↑