某同学配制0.02mol∙L -1 Na 2 S 2 O 3 500mL,方法如下:在分析天平上准确称取Na 2 S 2 O 3 ·5H 2 O2.482g,溶于蒸馏水中,加热煮沸,冷却,转移至500mL容量瓶中,加蒸馏水定容摇匀,保存待用。请指出其错误。
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