S + O2 = SO2
SO2 + 2NaOH = Na2SO3 + H2O
Na2SO3 + H2O = 2NaOH + SO2
NaOH + HCl = NaCl + H2O
NaCl + AgNO3 = NaNO3 + AgCl осадок
S + O2 = SO2
SO2 + 2NaOH = Na2SO3 + H2O
Na2SO3 + H2O = 2NaOH + SO2
NaOH + HCl = NaCl + H2O
NaCl + AgNO3 = NaNO3 + AgCl осадок