№1 1)2Na+2H2O=2NaOH+H2
2)2NaOH + FeSO4=Fe(OH)2+Na2SO4
3) 4Fe(OH)2 + 2H2O + O2 = 4Fe(OH)3
4) 2Fe(OH)3 = Fe2O3+3H2O
5)Fe2O3+3CO= 2Fe + 3CO2
№2 2K+2HNO3(p) = 2KNO3 + H2
K-1e= K/ 2/ 2
H+2e=2H/ 2/ 1
№3 m(смесь)=6г Решение: 2Al + 6HCl=2AlCl3+3H2
V(H2) = 3.7л Cu+ 2HCl=Cu2+H2
найти: Al-?; Cu-?; n(H2)=3,7л / 22,4л/моль= 0.16моль
n(Al)=x/2=0.16/3 n(Al)=0.1
n(Cu)=х/1=0,16/1 n(Cu)= 0,16
M(Al)=27 m(Al)=27*0.1=2.7
m(Cu)= 6-2.7=3.3
W(Al)= 2.7/6*100=45
W(Cu)=3.3/6*100=55
CuSO₄ + 2KOH = K₂SO₄ + Cu(OH)₂
Cu²⁺ + SO₄²⁻ + 2K⁺ + 2OH⁻ = 2K⁺ + SO₄²⁻ + Cu(OH)₂
Cu²⁺ + 2OH⁻ = Cu(OH)₂
H₂SO₄ + 2KOH = K₂SO₄ + 2H₂O
2H⁺ +SO₄²⁻ + 2K⁺ + 2OH⁻ = 2K⁺ + SO₄²⁻ + 2H₂O
2H⁺ + 2OH⁻ = 2H₂O
Zn + H₂SO₄ = ZnSO₄ + H₂
Zn⁰ + 2H⁺ + SO₄²⁻ = Zn²⁺ + SO₄²⁻ + H₂⁰
Zn⁰ + 2H⁺ = Zn²⁺ + H₂⁰
Na₂O + H₂SO₄ = Na₂SO₄ + H₂O
Na₂O + 2H⁺ + SO₄²⁻ = 2Na⁺ + SO₄²⁻ + H₂O
Na₂O + 2H⁺ = 2Na⁺ + H₂O
2KOH + CO₂ = K₂CO₃ + H₂O
2K⁺ + 2OH⁻ + CO₂ = 2K⁺ + CO₃²⁻ + H₂O
2OH⁻ + CO₂ = CO₃²⁻ + H₂O
Na₂O + CO₂ = Na₂CO₃