Preparation of Solutions
Stock Standard Solution. Weigh out 1.9412 g of dry
KH2PO4, reagent grade, and dissolve in deionized water
in a 1-L volumetric flask. Dilute to mark. The phosphorus
content of this solution expressed as P2O5 is 1000
ppm
請問，怎麼算出P2O5是1000 ppm的啊？
KH2PO4分子量136，P2O4分子量142，P分子量31。
謝謝
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