1、加蒸馏水将二者溶于试管中,
2、向其中加入过量KOH,过滤,将镁离子,除尽,
3、向其中加入过量Ba(NO3)2,过滤,将硫酸根离子除尽,
4、蒸馏,干燥,的纯净的KNO3
(注:倘使加Ba(OH)2过量,会引入氢氧化钡而无法除去,因为它易溶于水)——冯唐邀李广
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