2022届“3+3+3”高考备考诊断性联考卷（·） 语文参考答案

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15.参孝答案BD说明分析A错误,草酸是二元弱酸,一级电离抑制二级电离,KaC(H). C(HC2O4) C(H).c(C2OXc(H2C2O4)”BC(HC2 O4Ka1>Ka2,当lgX=0时,pHgc(H)=-gK,pH1=1.22 K2=10,所以直线1中X表示的是HCO5,直线Ⅱ中X表示的是c(HC2Q)。B正确,pH=1.22的溶液中存在电荷守恒关系c(Na+)+c(H+)c(HC2O)+2(C2G)+c(OH),溶液中(H+)>c(OH),则c(HC2O)+2c(C2Q)>c(Na)。C错误当pH<419时,溶液中c(H)>10-41mo/C2 O4K(HC2OA) C(H<1,则c(HC2O4)>c(C2O-);当pH>1.22时,溶液中C(H)<10 1.22 mol/L,KaIK2H)·c(HC2O1)、c(H)·c(c(H2 C2 O)C(HC2 O4(H+)·c(C2O-)cC2C)Kn·KC(H2C204'c(H2C2OA) C (H<1, c(H2 C2O)>C(C2O)D正确,pH=4.19的溶液中存在电荷守恒关系c(Na)+c(H+)=c(HC2Q)+2c(C2C)+c(OH),溶液中c(HC2O)=c(C2O-),c(H+)>c(OH),则3c(HC2O4)>c(Na+)。

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