题干

某温度时,BaSO4在水中的沉淀溶解平衡曲线如图所示.下列说法正确的是(   )

提示BaSO4(s)⇌Ba2+(aq)+SO42﹣(aq)的平衡常数Ksp=[Ba2+]•[SO42﹣],称为溶度积常数.

A:加入Na2SO4可以使溶液由a点变到b点

B:通过蒸发可以使溶液由d点变到c点

C:d点无BaSO4沉淀生成

D:a点对应的Ksp大于c点对应的Ksp

上一题 下一题 0.0难度 选择题 更新时间:2019-11-19 10:56:47

答案(点此获取答案解析)

C

同类题1

阅读理解

    Many years ago three soldiers, hungry and tired of battle, came upon a small village. The villagers, suffering a bad harvest and the many years of war, quickly hid what little they had to eat and met the three in the village square, shaking their heads and sighing, “Well, we are starving.” The soldiers communicated with each other quietly and then the first soldier turned to the villagers. “Your poor fields have left you nothing to share, so we will share what little we have: the secret of making soup from stones.”

    Naturally the villagers were intrigued and soon a fire was built to the villager's greatest pot, and then the soldiers dropped in three smooth stones.

     “Now this will be a fine soup,” said the second soldier, “but a handful of salt and some parsley (香芹) would make it wonderful!” Up jumped a villager, crying “What a piece of luck! I've just remembered where some has been left!”

    And off she ran, returning with parsley. As the pot was boiling, the memory of the villagers improved: soon carrots, beef and cream had found their way into the great pot. They ate and danced and sang well into the night, thrilled about the feast and their new-found friends. In the morning the three soldiers awoke, finding all the villagers standing before them. At their feet lay a bag of the village's best bread and cheese. “You have given us the greatest gift.” said an elder, “and we shall never forget.” The third soldier turned to the crowd, and said, “There is no secret, but this is certain: people working together can accomplish great things.” At last the light dawned on villagers. Off the soldiers wandered, down the road.