A phosphate solution is at pH = 10. What is the major phosphate specie in solution?
For H3PO4: pKa1 = 2.15; pKa2 = 7.20; pKa3 = 12.35
CHEM2411 TT2 Rapid Fire
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University
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Jenny Wong
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6 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
A phosphate solution is at pH = 10. What is the major phosphate specie in solution?
For H3PO4: pKa1 = 2.15; pKa2 = 7.20; pKa3 = 12.35
H3PO4
H2PO4-
HPO42-
PO43-
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Is a solution of Na2HPO4 acidic, basic, or neutral?
For H3PO4: Ka1 = 7.11 × 10-3 ; Ka2 = 6.32 × 10-8 ; Ka3 = 4.50 × 10-13
Acidic
Basic
Neutral
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
For the titration of 40 mL 0.1M triprotic acid, H3A with 0.1M of NaOH. What volume of NaOH should be added to the acid solution to reach the 3rd equivalence point?
40 mL NaOH
20 mL NaOH
120 mL NaOH
80 mL NaOH
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A buffer was prepared by mixing 5.0 mL of 0.10 M NaH2PO4 with 2.5 mL of 0.10 M HCl. What is the acid and conjugate base that makes up this buffer?
Acid: H3PO4
Conj. Base: H2PO4-
Acid: H2PO4-
Conj. Base: HPO42-
Acid: HPO42-
Conj. Base: PO43-
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following compound is the most soluble in water?
CuBr
(Ksp = 5.0 × 10-9)
CuCl
(Ksp = 1.9 × 10-7)
CuI
(Ksp = 1.0 × 10-12)
CuSCN
(Ksp = 4.0 × 10-14)
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following compound is equally soluble in acidic solution as it is in pure water?
HgS
Ca3(PO4)2
Al(OH)3
AgCl
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