Answer a. The endpoint is at neutrality and the equivalence point is at thje pK
ID: 835107 • Letter: A
Question
Answer
a.
The endpoint is at neutrality and the equivalence point is at thje pKa of the weak acid.
b.
The equivalence point is at neutrality and the endpoint is at the pKa of the weak acid.
c.
The equivalence point is where an observable physical change occurs and the endpoint is where the moles of titrant are equal to the moles of analyte.
d.
The endpoint is where an observable physical change occurs and the equivalence point is where the moles of titrant are equal to the moles of analyte.
Answer
a.
It becomes increasingly difficult to observe the end of the titration as concentration and/or the strength of the acid/base decrease.
b.
CO2 from the atmosphere will increase the basicity of the solution.
c.
Just one drop will complete the titration, a volume too small to rely on.
d.
The experimental error in the buret is too large to obtain appropriate accuracy.
(Use this information for questions 3-5.) Consider the titration of 20.00 mL 0.100 M hydroxyacetic acid with 0.050 M KOH.
Answer
a.
1.0 mL
b.
1.00 mL
c.
40 mL
d.
0.025 mL
Answer
a.
3.71
b.
3.35
c.
4.43
d.
3.86
Answer
a.
8.18
b.
7.00
c.
10.17
d.
3.832
Answer
a.
red - orange
b.
red - orange - yellow
c.
orange - yellow
d.
yellow - orange - red
7. Which of the following is true?
Answer
a.
Metal ions are Lewis bases AND EDTA is a Lewis acid.
b.
Metal ions are Lewis bases AND EDTA is an electron pair donor.
c.
Metal ions are Lewis acids AND EDTA is a Lewis base.
d.
Metal ions are Lewis bases AND EDTA is an electron pair acceptor.
8. EDTA is
Answer
a.
Tetradentate
b.
Hexadentate
c.
Tridentate
d.
Pentadentate
Answer
a.
Very dilute
b.
Strongly acidic
c.
Strongly basic
d.
Neutral
a.
The endpoint is at neutrality and the equivalence point is at thje pKa of the weak acid.
b.
The equivalence point is at neutrality and the endpoint is at the pKa of the weak acid.
c.
The equivalence point is where an observable physical change occurs and the endpoint is where the moles of titrant are equal to the moles of analyte.
d.
The endpoint is where an observable physical change occurs and the equivalence point is where the moles of titrant are equal to the moles of analyte.
Explanation / Answer
1. d.The endpoint is where an observable physical change occurs and the equivalence point is where the moles of titrant are equal to the moles of analyte.
2. a. It becomes increasingly difficult to observe the end of the titration as concentration and/or the strength of the acid/base decrease.
3. c. 40 mL
5. b. 7.00
7. c. Metal ions are Lewis acids AND EDTA is a Lewis base.
8. b. Hexadentate
9. c.Strongly basic
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