\(m{H_{2}C_{2}O_{4}}\)为二元弱酸，\(m{K_{a1}(H_{2}C_{2}O_{4})=5.4×10^{-2}}\)，\(m{K_{a2}(H_{2}C_{2}O_{4})=5.4×10^{-5}}\)，设\(m{H_{2}C_{2}O_{4}}\)溶液中\(m{c(}\)总\(m{)=c(H_{2}C_{2}O_{4})+c(HC_{2}O_{4}^{-})+c(C_{2}O_{4}^{2-})}\)。室温下用\(m{NaOH}\)溶液滴定\(m{25.00 mL 0.1000mol⋅L^{-1}}\)\(m{H_{2}C_{2}O_{4}}\)溶液至终点。滴定过程得到的下列溶液中微粒的物质的量浓度关系一定正确的是\(m{(}\)　　\(m{)}\) --优优班--学霸训练营

\(\rm{H_{2}C_{2}O_{4}}\)为二元弱酸，\(\rm{K_{a1}(H_{2}C_{2}O_{4})=5.4×10^{-2}}\)，\(\rm{K_{a2}(H_{2}C_{2}O_{4})=5.4×10^{-5}}\)，设\(\rm{H_{2}C_{2}O_{4}}\)溶液中\(\rm{c(}\)总\(\rm{)=c(H_{2}C_{2}O_{4})+c(HC_{2}O_{4}^{-})+c(C_{2}O_{4}^{2-})}\)。室温下用\(\rm{NaOH}\)溶液滴定\(\rm{25.00 mL 0.1000mol⋅L^{-1}}\) \(\rm{H_{2}C_{2}O_{4}}\)溶液至终点。滴定过程得到的下列溶液中微粒的物质的量浓度关系一定正确的是\(\rm{(}\)　　\(\rm{)}\)

A．\(\rm{0.1000mol⋅L^{-1}H_{2}C_{2}O_{4}}\)溶液：\(\rm{c(H^{+})=0.1000mol⋅L^{-1}+c(C_{2}O_{4}^{2-})+c(OH^{-})-c(H_{2}C_{2}O_{4})}\)

B．\(\rm{c(Na^{+})=c(}\)总\(\rm{)}\)的溶液：\(\rm{c(Na^{+}) > c(H_{2}C_{2}O_{4}) > c(C_{2}O_{4}^{2-}) > c(H^{+})}\)

C．\(\rm{pH=7}\)的溶液：\(\rm{c(Na^{+})=0.1000mol⋅L^{-1}+c(C_{2}O_{4}^{2-})-c(H_{2}C_{2}O_{4})}\)

D．\(\rm{c(Na^{+})=2c(}\)总\(\rm{)}\)的溶液：\(\rm{c(OH^{-})-c(H^{+})=2c(H_{2}C_{2}O_{4})+c(C_{2}O_{4}^{2-})}\)

【考点】弱电解质的电离平衡

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难度：较易

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