现有一种溶液,其中可能含有Mg2+、Al3+、Fe2+、Cu2+、NH4+。当加入一种

现有一种溶液,其中可能含有Mg2+、Al3+、Fe2+、Cu2+、NH4+。当加入一种淡黄色固体并加热溶解时,有刺激性气味的气体放出和白色沉淀生成,加入淡黄色固体的物质的量(横坐标)与析出的沉淀和产生气体的物质的量(纵坐标)的关系如图所示。试回答下列问题:

最终的白色沉淀的成分是(填化学式)       ,你的理由是                                    

                                              

(2)试确定该溶液中可能含有以上离子中的哪些离子并计算其相应的物质的量,完成下表(可以不填满)

可能含有的离子

(填离子符号)

相应的物质的量

    

    

(4)图中a点的值为    

(5)图中b点的气体组成成分是(填化学式)        ,其物质的量之比是     

答案

(1)Mg(OH)2(1分)氢氧化镁不溶于强碱,氢氧化铝是两性氢氧化物,可以溶于强碱。(2分)

(2)

(3) 9

(4)NH O2  ;   3:2


解析:

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