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【简答题】
（12分）常温下，ZnS的溶度积常数K sp =1.20×10 -23 ,H 2 S的电离常数K 1 =1.32×10 -7 K 2 =7.10×10 -15 回答下列问题： （1）K 1 ＞＞K 2 的原因是 （2）0.1 mol/L H 2 S溶液中氢离子的物质的量浓度是 （填字母） A．等于0.1mol/L B．等于0.2mol/L C．小于0.1mol/L D．在0.1~0.2mol/L之间 （3）0.1mol/LNa 2 S 溶液能使pH试纸变蓝，表明该现象的离子方程式是 （4）已知0.1mol/LNaHS溶液的pH约为9，则0.1mol/LNaHS溶液中各离子浓度由大到小的顺序是 。该溶液中的质子守恒关系式为 。 （5）向0.01mol/L的ZnCl 2 溶液中通入H 2 S(g)至饱和（c(H 2 S)按0.1mol/L计），为保证不产生ZnS沉淀，应控制c(H + )不低于 mol/L(已知7.81 1/2 =2.8)
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【简答题】主动脉经膈的____入腹腔,至第4腰椎体下缘平面分为左右髂总动脉二支。
查看完整题目与答案
【单选题】Which of the following statements is true?
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Only respected journalists can post information on t he Internet for others to see.
B.
Respected journalists will probably become more important than before.
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Everyone is using the Internet now.
D.
The greatest potential of public participation of the Internet is in the near future.
查看完整题目与答案