1.
(2018·江苏)
H2C2O4为二元弱酸,Ka1 (H2C2O4 ) =5.4×10−2 , Ka2 (H2C2O4 ) =5.4×10−5 , 设H2C2O4溶液中c(总)=c(H2C2O4) +c(HC2O4−) +c(C2O42−)。室温下用NaOH溶液滴定25.00 mL 0.1000 mol·L−1H2C2O4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( )
A . 0.1000 mol·L−1 H2C2O4溶液:c(H+ ) =0.1000 mol·L−1+c(C2O42− )+c(OH−)−c(H2C2O4 )
B . c(Na+ ) =c(总)的溶液:c(Na+ ) >c(H2C2O4 ) >c(C2O42− ) >c(H+ )
C . pH = 7的溶液:c(Na+ ) =0.1000 mol·L−1+ c(C2O42−) −c(H2C2O4)
D . c(Na+ ) =2c(总)的溶液:c(OH−) −c(H+) = 2c(H2C2O4) +c(HC2O4−)