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Harris Quantitative Analysis Chapter 10
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What is the principal form of benzoic acid at pH = 6.00?
 
Benzoate
 
Benzoic Acid
What is the principal form of benzoic acid at pH = 3.00?
 
Benzoic Acid
 
Benzoate
10 The Ka of acetic acid is 1.7 *10-5 The pH of a buffer prepared by combining 50.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid is __________.
 
4.77
 
9.26
 
7
 
9.37
Which one of the following pairs cannot be mixed together to form a buffer solution?
 
RbOH, HBr
 
KOH, HF
 
H3PO4, KHPO4
 
NaC2H3O2, HCl (NaC2H3O2 = acetate)
Which of the following is FALSE for an aqueous solution of the weak acid H3A?
 
A^3− is acidic.
 
H3A is acidic.
 
HA^2-
 
HA2− is amphiprotic.
(T or F)A buffer made from a diprotic acid is treated in the same way as a buffer made from a monoprotic acid.
 
True
 
False
What is the pH of a 0.100 M maleic acid (pK1 = 1.89, pK2 = 6.23) solution?
 
1.52
 
8.50
 
1.23
 
5.74
(T or F) For most diprotic species, the acidic (H2A) and basic (A2−) forms can be treated as monoprotic species when calculating the pH of a solution.
 
True
 
False
(T or F) The following reaction is an example a hydrolysis reaction: L− + H2O<====>HL + OH−
 
True
 
False
Which equation shows the correct relationship between the Ka and Kb values for a diprotic species?
 
Ka1 × Kb2 = Kw
 
Ka1 × Kb1 = Kw
 
Ka1 × Ka2 = Kw
 
Kb1 × Kb2 = Kw
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