Н3+.....=Р2О5+......... ,NSO3+......=Na2Sio4+...... ,CaO+......=CaSiO3;
Na2Co3+HCl=................... . NaOH+HCl=............ .Fe(OH)3+HNO3=............... .Mg+H2SO4=...........;
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MgSO4+H2
2NaCL+H2CO3= Na2CO3+2HCL
NaOH+HCL=NaCL+H20
Fe(OH)3+HNO3= FE(NO)3+H20