题目

化工原料K2([Cu(C2O4)2]·2H2O(二草酸合铜酸钾晶体)为蓝色针状或絮状沉淀,某校同学设计实验制备K2([Cu(C2O4)2]·2H2O,并进行性质探究。已知: Cu(OH)2分解温度为80℃; Cu2O 为红色。回答下列相关问题: (1) [实验一] 制备K2([Cu(C2O4)2]·2H2O晶体向CuSO4溶液中加入足量NaOH,搅拌加热至80~90℃,观察到的现象是; 采用如图装置抽滤,打开水龙头,可在布氏漏斗中快速过滤出沉淀,快速过滤的原理是。 (2) 将H2C2O4·2H2O和K2CO3溶液混合制备KHC2O4溶液,则酸根据对话内容,从方框内选择合适的句子补全对话。Kate: Hello, Tom1.Tom: I’m fine. Thank you! What about you , Kate ?Kate: I’m OK., thank you. Tom2.Tom: It’s a photo of my family.Kate: 3.Tom: He is my brother. Kate: 4.Tom: No, she isn’t. She is my aunt. Kate: Excuse me, Tom. 5.Tom: Look, it’s under the chair.Who is he ? What’s this ?How are you ? Where is your dog?Is she your mother?Who is he ? What’s this ?How are you ? Where is your dog?Is she your mother?
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