(1)nNaOH<=nH2S时反应生成NaHS和H2O，蒸干水后生成NaHS.反应方程式为：NaOH+H2S=NaHS+H2O;(2)nH2S(3)nNaOH>=2nH2S时反应生成Na2S和H2O，蒸干水后生成Na2S.反应方程式为：2NaOH+H2S=Na2S+2H2O;
Na2S或NaHS方程式NaOH+H2S=NaHS+H2ONaHS+NaOH=Na2S+H2O
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