作者liauyiru (VERITAS)
看板TransBioChem
标题[化学] 酸与硷的问题
时间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
这题是金榜化学题库分章11-17
想好久想不出来@@...只观察到pKa的值跟答案的pH值很接近
会的人麻烦回一下^^...
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