Re: [化學] 99台聯大A1 19 20

看板TransBioChem作者water0bearer (霖)時間15年前 (2010/08/07 00:57)推噓1(1推 0噓 5→)

留言6則, 4人參與討論串2/2 (看更多)

※ 引述《asd789456123 (123)》之銘言： : 19.How many mmoles of HCL must be added to 100ml of a 0.10M solution of : methylamine(pKb=3.36)to give a buffer having a PH of 10? : (A)8.1 (B)18.7 (C)20.0 (D)41.5 (E)12.7 : Ans:(A)8.1 pOH = pKb + log[HA]/[A-] 4 = 3.36 + log[HA]/[A-] log[HA]/[A-] = 0.64 [HA]/[A-] = 4.2(懶的按計算機，自己估計的) CH3NH2 + HCl ---> CH3NH3+ + Cl- 0.1*100 = 10mmole 原來CH3NH2的量設加入Xmmole X / (10-X) = 4.2 X差不多=8.1 : 20.Of energy, work, enthalpy, and heat, how many are stable functions? ^^^^^^ ^^^^^^^^這兩個 ^state吧!? : (A)0 (B)1 (C)2 (D)3 (E)4 : Ans:(C)2 : 請問是哪兩個呢? 感激不盡 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 220.136.185.78

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BIEGABOY

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BIEGABOY

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mensen

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