NaOH+HCL=K2O+H2O=K+H2O=Ca

NaOH+HCL=NaCl+H2OK2O+H2O=2KOH 2K+H2O=K2O+HCa (OH) 2+2HNO3=Ca (NO3) 2+2H2O2Fe+3 H2SO4=Fe2 (SO4) 3+3H22Na2S+2HCl (разб.)=2NaCl+H2SKOH+HCl=KCl+H2O N2O5+H2O=2HNO3H2SO4+Ba (OH) 2=BaSO4+2H2O H2+S=H2S Fe2O3+H2=FeO+H2O