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(8分)将0.2molMg、Al的混合物用盐酸完全溶解，放出标准状况下5.6L气体，然后再滴入2mol/LNaOH溶液，请回答：（写计算过程） （1）若该Mg、Al的混合物与盐酸恰好完全反应，在滴加NaOH溶液过程中，欲使Mg 2+ 、Al 3+ 刚好沉淀完全，则滴入NaOH溶液的体积是多少？ （2）若该Mg、Al混合物溶于200ml 3mol/L盐酸后，滴入NaOH溶液，使所得沉淀中无Al(OH) 3 ，则滴入NaOH溶液的体积最少为多少？
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