[問題] 有關Henry's and Raoult's law的問題

看板Chemistry作者 (還是一隻幼鼠)時間16年前 (2008/02/15 23:57), 編輯推噓12(12推 0噓 20→)
留言32則, 9人參與, 最新討論串1/1
In a binary solution, which statement is always true? (a) Both solute and solvent obey Raoult's law at zero temperature. (b) Both solute and solvent obey Raoult's law at high temperatures. (c) Solute and solvent obeys Raoult's and Henry's law, respectively. (d) Solute and solvent obeys Henry's and Raoult's law, respectively. (e) None is true. 請問板上高手 這題該怎麼解 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 210.240.195.246
推
02/16 00:02, , 1F
我認為是D
02/16 00:02, 1F
推
02/16 00:04, , 2F
我認為是D 跟樓上高手一樣~
02/16 00:04, 2F
推
02/16 00:05, , 3F
請問一下原因
02/16 00:05, 3F
推
02/16 00:17, , 4F
啊!? 因為...物化課本就是這樣寫的啊~^^"
02/16 00:17, 4F
推
02/16 00:21, , 5F
那是在整個溶液範圍都是正確的嘛 還是在部分範圍
02/16 00:21, 5F
推
02/16 00:27, , 6F
在理想稀薄溶液下~答案是D
02/16 00:27, 6F
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02/16 00:28, , 7F
啊!? 可是題目好像沒有說是在理想稀薄溶液耶.....糟糕.
02/16 00:28, 7F
推
02/16 00:58, , 8F
我覺得是 B 因為 高溫低壓 real ~~~> ideal
02/16 00:58, 8F
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02/16 00:58, , 9F
而ideal情形溶質跟溶劑才會Obey that two laws
02/16 00:58, 9F
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02/16 01:01, , 10F
不過就理論而言是 D 但如同樓上說 沒提 ideal
02/16 01:01, 10F
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02/16 01:01, , 11F
但題目又說 always 所以其實 E 也是不錯的選擇
02/16 01:01, 11F
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02/16 01:02, , 12F
所以 ㄎㄎ 我也亂了 >"<
02/16 01:02, 12F
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02/16 02:15, , 13F
對喔我也沒看到是否理想.....所以不太確定答案了
02/16 02:15, 13F
推
02/16 12:38, , 14F
Henry's law適用於稀薄液-氣(如海-氣介面)
02/16 12:38, 14F
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02/16 12:39, , 15F
Raoult's law適用在氣體高度溶解於液體的情況(如氨-水)
02/16 12:39, 15F
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02/16 12:45, , 16F
不過只聽過Henry's law不能用在高度溶解的情況
02/16 12:45, 16F
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02/16 12:46, , 17F
卻沒聽過Raoult's law的使用限制
02/16 12:46, 17F
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02/16 12:47, , 18F
答案"可能"是 (c) 吧 ,有錯請指正
02/16 12:47, 18F
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02/16 12:49, , 19F
抱歉打錯 答案可能是(e) 有錯請指正
02/16 12:49, 19F
推
02/16 13:45, , 20F
不過剛才又想了一下
02/16 13:45, 20F
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02/16 13:45, , 21F
選項中已經有說是Solute與Solvent
02/16 13:45, 21F
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02/16 13:46, , 22F
那麼濃度就不是問題啦
02/16 13:46, 22F
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02/16 13:46, , 23F
Solute是溶液中較稀薄的物質(Henry's適用)
02/16 13:46, 23F
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02/16 13:47, , 24F
Solvent是溶液中較濃的物質(Raoult's適用)
02/16 13:47, 24F
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02/16 13:47, , 25F
所以是(d) 以上觀念不知對不對 有錯再討論看看吧
02/16 13:47, 25F
推
02/16 14:48, , 26F
C D 都對吧 可以用Gibbs-Duhen eq.證明
02/16 14:48, 26F
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02/16 14:51, , 27F
Duhem
02/16 14:51, 27F
推
02/17 12:44, , 28F
我發現我好像誤解題義了,答案應該是E
02/17 12:44, 28F
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02/17 12:45, , 29F
VLE系統使用亨利跟勞特定律要在氣相與溶液相均在理想狀態
02/17 12:45, 29F
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02/17 23:02, , 30F
H跟R在實際溶液中只是近似公式而已...不能說完全正確
02/17 23:02, 30F
推
02/18 15:16, , 31F
題目中提到binary，是指溶質與溶劑皆為液體狀態嗎？
02/18 15:16, 31F
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02/19 00:50, , 32F
謝謝
02/19 00:50, 32F
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