2NaOH + SO2（少量）=Na2SO3 + H2O
NaOH + SO2(过量)= NaHSO3
如果适量,n(NaOH)/n(SO2)=1---2之间, Na2SO3 和NaHSO3 全有.
如: n(NaOH)/n(SO2)=3/2化学方程式为:
3NaOH + 2SO2= Na2SO3+ NaHSO3 + H2O
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