BaCO3+2HNO3=Ba(NO3)2+H2O+CO2
HNO3+NaOH=NaNO3+H2o
6HNO3+Al2O3=2Al(NO3)3+3H2O
AlCl3 + 3NaOH = Al(OH)3 + 3NaCl
<span>2 Al(OH)3 = Al2O3 + 3 H2O</span>
2Cr(+6) +6e- --> 2Cr(+3) I 1
S(-2) -2e- -----------> S(0) I 3
<span>H3ASO4 = H[+] + H2AsO4[-]
H2AsO4[-] = H[+] + HAsO4[2-]
HAsO4[2-] = H[+] + AsO4[3-]
Mg(OH)2 = MgOH[+] + OH[-]
MgOH[+] = Mg[2+] + OH[-]
Fecl2 = Fe[2+] + 2Cl[-]
HBr = H[+] + Br[-]
Al2(SO4)3 = 2Al[3+] + 3SO4[2-]</span>