Помогите пожалуйста!, химия

1)
3KOH+H3PO4=K3PO4+3H2O
3K(+)+3OH(-)+3H(+)+PO4(-3)=3K(+)+PO4(-3)+3H2O
3OH(-)+3H(+)=3H2O
2)
2NaOH + Pb(NO3)2 = Pb(OH)2↓ + 2NaOH
2Na[+] + 2OH[-] + Pb[+2] + 2NO3[-] = Pb(OH)2↓ + 2Na[+] + 2OH[-]
Pb[+2] + 2OH[-] = Pb(OH)2↓
3)
Zn(OH)2 + 2HCl = ZnCl2 + 2H2O
Zn(OH)2 + 2H[+] + 2Cl[-] = Zn[2+] + 2Cl[-] + 2H2O
Zn(OH)2 + 2H[+] = Zn[2+] + 2H2O
4)
Ba + 2H2O = Ba(OH)2 + H2
Ba + 2H2O = Ba[2+] + 2OH[-] + H2
5)
Pb(NO3)2 + K2S = PbS↓ + 2KNO3
Pb[2+] + 2NO3[-] + 2K[+] + S[2]- = PbS↓ + 2K[+] + 2NO3[-]
Pb[2+] + S[2-] = PbS↓.