常温下，向\(\rm{20mL}\) \(\rm{0.lmol⋅L^{-1}}\)的草酸\(\rm{(H_{2}C_{2}0_{4})}\)溶被中不断滴入\(\rm{0.lmol⋅L^{-1}}\)的\(\rm{KOH}\)溶液，溶液的\(\rm{pH}\)变化曲线如图所示\(\rm{.}\)下列有关说法正确的是

\(\rm{(}\)　　\(\rm{)}\)

A．\(\rm{a}\)点溶液呈酸性，是因为\(\rm{HC_{2}0_{4}^{-}}\)的电离程度小于其水解程度

B．\(\rm{b}\)点：\(\rm{c(K^{+})=c(HC_{2}O_{4}^{-})+2c(C_{2}O_{4}^{2-})}\)

C．\(\rm{c}\)点：\(\rm{c(K^{+})=c(H_{2}C_{2}O_{4})+c(HC_{2}O_{4}^{-})+2c(C_{2}O_{4}^{2-})}\)

D．\(\rm{d}\)点：\(\rm{c(K^{+}) > c(C_{2}O_{4}^{2-}) > c(OH^{-}) > c(HC_{2}O_{4}^{-}) > c(H^{+})}\)

【考点】溶液pH定义及计算

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