题目

Nancy: Hey, Katie. What a surprise to see you here!Katie: Hey, Nancy. Nice to meet you. It’s 3 years ___________we met last time.Nancy: That’s true._________ everything going?Katie: Not bad, everything stays the same. _____________ the way, why are you here?Nancy: I’m choosing something for my journey to Chiang Mai.Katie: Wow, ___________ like fun. But it’s too hot now. Nancy: Yes, it is. But there’s a water festival there from April 13th to 15th. It’s ___________ to the Water Festival of Dai people in Yunnan Province. Katie: Oh, I know the two festivals are like each other. Then w某废旧锂电池材料含有钴酸锂(LiCoO2)、导电剂石墨和铝粉等。回收废旧锂电池中钴的工艺流程如下：已知：Ksp(CoC2O4)=2.5×10-9，Ksp(CoCO3)=1.5×10-13回答下列问题：(1)“浸出液”的主要成分是LiHC2O4、Al(HC2O4)3，“浸出渣”的主要成分是CoC2O4。“浸出”中生成CoC2O4的化学方程式为 _______ ，若H2C2O4用量过大，CoC2O4的产率反而会降低，原因是____。(2)“转化”中加入Na2CO3溶液发生反应的离子方程式为___________，该反应进行的程度较大，试用平衡常数K解释原因 _____ 。(3)“电解”时装置如图所示。阳极的电极反应式为______，电解后a室中的电解液可返回 ________工序继续使用。(4)某废旧锂电池粉末中LiCoO2的质量分数为w，将mkg该废料进行回收利用，电解得到钴nkg，钴的回收率为____。