已知PbSO₄（M=303．26g.mol^-1）在水中的溶解度是0．048g.L^-1，它的Ksp=（）。

Which of the following is stated to be true?A．A revisit to the place where you have learned something contributes to memory.B．Failing to understand a film indicates the beginning of the loss of memory.C．Top chess players tend to have better memories than the rest of us.D．People who are good at remembering images are poor at remembering names. 点击查看答案

某废液[SO42-]=6．0×10-4mol.L-1，在40L该溶液中加入1．0L 0．10mol.L-1 BaCl2溶液是否有BaSO4沉淀生成。如有沉淀生成，生成多少克的BaSO4沉淀?最后溶液中[SO42-]为多少? 点击查看答案