其实应该这么看:
强碱强酸离子(因为他们不水解)------显中性:如Na+,K+,Ba2+,Ca2+
SO42-,NO3-,Cl-
弱碱离子水解后显酸性:如Mg2+,Al3+,Fe3+,Fe2+,Cu2+,NH4+
弱酸离子水解后呈碱性:如CO32-,HCO3-,S2-,HS-,SO32-,HSO3-,ClO-,PO43-,HPO42-,H2PO4-
CH3COO-,SiO32-,S2O32-,AlO2-等等
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