高三第二轮化学实验专题复习.doc

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1、高三第二轮化学实验专题复习(基本操作)一、食盐中混有少量Na2SO4晶体，设计实验提纯NaCl晶体。基本步骤：①将样品溶解得到样品溶液；②在样品溶液中滴加过量的BaCl2（aq）；③静置，在上层清液中滴加过量的Na2CO3（aq）；④过滤；⑤在滤液中滴加过量的盐酸；⑥加热所得到溶液得到NaCl晶体。问题：①简述溶解样品的基本操作:________________________________________________________________________________________________

2、__________________________________________________________________________________________________________.②BaCl2（aq）为何要加过量？_____________________________________________________________________________________________________________________________________.如何判定

3、滴加过量?________________________________________________________________________________________________________________________.③Na2CO3（aq）为何要加过量？______________________________________________________________________________________________________________________

4、_______________.如何判定滴加过量?________________________________________________________________________________________________________________________④盐酸为何要加过量？___________________________________________________________________________________________________________

5、_________________________.如何判定滴加过量?____________________________________________________________________________________________________________________________________.⑤过滤所得沉淀成份为____________;写出生成这些沉淀的离子方程式:________________________________________________________

6、___________.⑥过滤操作中为何要洗涤沉淀?_________________________________________________________________________________________________________________________________________.如何洗涤沉淀?___________________________________________________________________________________________

7、_________________________________.如何判定沉淀洗涤干净?____________________________________________________________________________________________________________________.⑦加热溶液得到NaCl晶体操作中必需的仪器除玻璃棒外,还有____________________________________________;其中使用玻璃棒的目的是_______________

8、_____________________________________________________;加热溶液加热到什么程度?____________________________________________________________________________________________________