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市场上有一种自热米饭，其饭盒中有一小包粉末，粉末的主要成分是、镁粉和氯化钠。利用这包粉末，进行了如下的探究实验： （1）验证并分离的最简单的物理方法是_______________。 （2）若要进一步分离镁粉和氯化钠而得到干燥的镁粉，要进行的操作是：溶解、________、洗涤、干燥。在前两步实验操作中都用到的玻璃仪器为________（填一种）。 （3）在（2）所得镁粉中加入一定量的稀硫酸，使固体完全溶解。对所得溶液中含有的溶质，作如下猜想：猜想1：溶质只有硫酸镁。猜想2：溶质有硫酸镁和_________（填化学式）。 经查阅资料：硫酸镁溶液酸性极弱。 若要检验猜想2是否正确，能不能选用无色酚酞溶液作为试剂？________（填“能”或“不能”）。选用一种金属单质进行实验，观察到了明显的现象，从而肯定了猜想2是正确的，写出发生反应的化学方程式：___________________________。
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