作者liauyiru (VERITAS)
看板TransBioChem
標題[化學] 酸與鹼的問題
時間Tue Jun 13 22:25:14 2006
You have the following reagents on hand:
Sodids(PKa of acid form is given) solutions
Benzoic acid(4.9) 5.0M HCl
Sodium acetate(4.74) 1.0M acetic acid
Potassium fluoride(3.14) 2.6M NaOH
Ammonium chloride(9.26) 1.0M HOCl(7.46)
What combinations of reagents would you use to prepare buffers
at the following pH values?
(A)3.0 (B)7.0 (C)5.0 (D)9.0
answer:(A)pH=3,KF+HCl
(B)pH=7,HOCl+NaOH
(C)pH=5,CH3COOH+CH3COONa
(D)pH=9,NH4Cl+NaOH
這題是金榜化學題庫分章11-17
想好久想不出來@@...只觀察到pKa的值跟答案的pH值很接近
會的人麻煩回一下^^...
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