英语八上23期周报2022答案

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+)。

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

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