\(m{25℃}\)时，用\(m{NaOH}\)溶液滴定\(m{H_{2}C_{2}O_{4}}\)溶液，溶液中\(m{-\lg \dfrac {c(H^{+})}{c(H_{2}C_{2}O_{4})}}\)和\(m{-\lg c(HC_{2}O_{4}^{-})}\)或\(m{-\lg \dfrac {c(H^{+})}{c(HC_{2}O_{4})}}\)和\(m{-\lg c(C_{2}O_{4}^{2-})}\)关系如图所示，下列说法正确的是\(m{(}\)　　\(m{)}\) --优优班--学霸训练营

\(\rm{25℃}\)时，用\(\rm{NaOH}\)溶液滴定\(\rm{H_{2}C_{2}O_{4}}\)溶液，溶液中\(\rm{-\lg \dfrac {c(H^{+})}{c(H_{2}C_{2}O_{4})}}\)和\(\rm{-\lg c(HC_{2}O_{4}^{-})}\)或\(\rm{-\lg \dfrac {c(H^{+})}{c(HC_{2}O_{4})}}\)和\(\rm{-\lg c(C_{2}O_{4}^{2-})}\)关系如图所示，下列说法正确的是\(\rm{(}\)　　\(\rm{)}\)

A．曲线\(\rm{L_{1}}\)表示\(\rm{-\lg \dfrac {c(H^{+})}{c(H_{2}C_{2}O_{4})}}\)和\(\rm{-\lg c(HC_{2}O_{4}^{-})}\)的关系

B．\(\rm{Ka_{2}(H_{2}C_{2}O_{4})}\)的数量级为\(\rm{10^{-2}}\)

C．\(\rm{NaHC_{2}O_{4}}\)溶液中\(\rm{c(Na)^{+} > c(HC_{2}O_{4}^{-}) > c(H_{2}C_{2}O_{4}) > c(C_{2}O_{4}^{2-})}\)

D．向\(\rm{0.1mol/LH_{2}C_{2}O_{4}}\)溶液中加少量水\(\rm{ \dfrac {c(HC_{2} O_{ 4 }^{ - })}{c(H_{2}C_{2}O_{4})}}\)减小

【考点】中和滴定实验

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