摘要：常温下.0.1mol / L的KH2PO4和0.1mol / L的K2HPO4溶液pH分别约为4和11.将等物质的量的KH2PO4和K2HPO4混合后溶于足量的水形成溶液.下列推测合理的是A.上述溶液的pH范围为4~7B.上述溶液中:c(K+)>c(H2PO4―)>c(HPO42―)>c (OH―)>c(H+)C.上述溶液中:c(K+)∶[c(H2PO4―)+c(HPO42―)] = 3∶2D.上述溶液中:c(K+) +c(H+)=c(H2PO4―)+2c(HPO42―)+3c(PO43―)+c (OH―)

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