有什麼compound會吸水(20分)要多dd wor^^唔該

2008-03-19 4:52 am

有咩compound會吸水
姐係有咩salt 呀solution可以吸水
同埋點解可以吸水既?

回答 (2)

[匿名]

2008-03-20 8:34 am

✔ 最佳答案

如果個compound係gas 的話可以用
1. conc. H2SO4(l)
2.anhydrous CaCl2(s)
3.anhydrous MgSO4(s)
4.anhydrous KOH(s)
5.anhydrous NaOH(s)

個如果個compound 係liquid state 就唔好用conc.H2SO4(l),
因為大家都係liquid, 要用d separation method 先分得開,
應該用anhydrous CaCl2(s) 同 anhydrous MgSO4(s)等solid
吸完水再用filtration就可分出個pure compound

如果個compound 係solid state 的話,用oven (焗爐)heat 用compound,
總之唔高過boiling point就得

不過,仲有要留意個compound係acidic or alkaline,
1同2 都係acidic, 3就係neutral, 4同5係alkaline , 即係dry alkaline compound 唔可以用1同2
因為alkaline 同acidic會有reaction, 個compound 會少左
相反acidic compound 唔可以用4同5

參考: http://zh.wikipedia.org/w/index.php?title=%E6%B0%A2%E6%B0%A7%E5%8C%96%E9%92%BE&variant=zh-tw

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用戶7369

2008-03-19 5:46 am

calcium chloride, sodium hydroxide, potassium hydroxide,
concentrated sulphuric acid.
these can be regarded as dehydrating agents.

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