Zadanie 4
a) 1. N2O5+Na2O--->2NaNO3
2. NaOH+HNO3--->NaNO3+H2O
3. Na2CO3+2HNO3--->2NaNO3+H2O+CO2
4. Na2O+2HNO3--->2NaNO3+H2O
5. 2Na+2HNO3--->2NaNO3+H2
b) 1. Na2SO4+Ca(OH)2--->2NaOH+CaSO4↓
2. NaH+H2O--->NaOH+H2
3. Na2O+H2O--->2NaOH
4. 2Na+2H2O--->2NaOH+H2
