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體積莫耳濃度的運用

Oct 8th 2013, 13:23

先從定義上來上,
莫耳體積濃度的定義為：某物質的莫耳數/1公升的溶液
ppm的定義為百萬分之一,可為體積或重量比,但在這裏是用重量比,在化工上重量比用得也比較多,後續回答都用重量比
以水溶液來說,1公升的水會有1000公克=1百萬毫克(mg)
只要溶質不要多到可以大幅改變溶液的比重的話,
要算溶液的ppm濃度的話,只要看1公升的水裏有多少毫克的溶質,
就可以符合前述的百萬分之一(ppm),(在不會改變體積只有1公升的前題下),
最後要換算莫耳體積濃度,
1.莫耳數的計算基準為公克(不是毫克),所以每公升某物質的重量要除以1000(1公克=1000毫克),所得到的答案即為每公升溶液中某物質的公克數,
2.公克數除以分子量即為莫耳數(分子量是以公克為單位)
3.以前述溶質只要不要多到可以大幅改變溶液的比重，即1百萬毫克的溶液體積仍是1公升,即可符合第2行的定義:某物質的莫耳數/1公升的溶液
最後,在經驗上,還好只要是用ppm等級計算的溶液,對比重幾乎不會有明顯的影響

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