QUESTION 17
Which of the following weak acid/conjugate base pairs is best suited for buffering a solution to a pH of 5 ?
Weak Acid
Conjugate Base
Ka_(a)
Acetic Acid (CH_(3)(C)/(O)O H)
Acetate ((CH_(3)(C)/(O)O ^(()-))
1.8 imes 10^(-5)
Dihydrogen phosphate (H_(2)PO_(4)^(-))
Hydrogen phosphate (HPO_(4)^(-)),6.2 imes 10^(-8)
A. Acetic Acid (CH_(3)(C)/(O)O H)
Acetate ((CH_(3)(C)/(O)O ^(()-))pair
B. Dihydrogen phosphate (H_(2)PO_(4)^(-))
Hydrogen phosphate (HPO_(4)^(-))pair
C. Both of them will work.
D. None of them will work.
QUESTION 17
Weak Acid Conjugate Base Ka Acetate (CH3COO) 1.8 x 10-5 Acetic Acid (CH3COOH Hydrogen phosphate (HPO4) 6.2 x 10-8 Dihydrogen phosphate(H2PO4)
O A.Acetic Acid (CH3COOH)
Acetate(CH3COO pair
O B.Dihydrogen phosphate (H2PO4) O C.Both of them will work
Hydrogen phosphate(HPO4)pair
O D.None of them will work