a点对应的溶液中c(Na+)+c(H+)=c(OH-)+3c()[详解]A.H2C2O4是二元弱酸,电离方程式书写应用可逆符号,选项A错误;B.由图可知,H2C2O4的pKa1=1.2,选项B错误;C.加入20 mLNaOH溶液时,恰好生成NaHC2O4,由图可知,溶液显酸性,则HC2O4-的电离程度大于其水解程度,故溶液中c(C2O42- )>c(H2C2O4),选项C错误...
Very interesting is also the fact that H2SO4-assisted reaction is the most favourable for the hydrogen transfer from HN(NO2)2 to O2NNN(O)OH, due to the smallest pKa (3.0) value of H2SO4 than H2O, HCOOH, H2SO4 and CH3CH2COOH, and also because of the largest 鈭燲HY (the angle ...