动词+s规则

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• FeS的电离中c(Fe+)*c(s2-)=6.25*10^-18,又知溶液中,[c(H+)]^2*c(S2-)=1*10^-22现将适量的FeS,投入饱和溶液中,要使溶液的c(Fe2+)达到1mol/L,应调节溶液的PH为多少?
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• 动词+s规则动词+ed规则例：1直接加s .writes、redads.2.