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二宝哥

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[求助] 如何由0.02mo1/L的KCl溶液配置的不同磷浓度的KH2PO4溶液,求指点

做等温吸附试验时步骤如下:称取60目的沸石2g于250mL具塞锥形瓶中,分别加入50mL由0.02mo1/L的KCl溶液配置的不同磷浓度的KH2PO4溶液,置于恒温摇床中,在120r/min, 25度条件下振荡48h后,过滤,测定滤液中磷素浓度,根据其浓度变化,计算沸石对磷素的吸附量,绘制沸石磷素吸附等温线。
        但是如何由0.02mo1/L的KCl溶液配置的不同磷浓度的KH2PO4溶液,比如由0.02mo1/L的KCl溶液配置的磷素质量浓度为5mg/L的KH2PO4溶液如何配置,求大神指点啊!
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