Bundle: Chemistry & Chemical Reactivity, Loose-Leaf Version, 9th + OWLv2, 4 terms (24 Months) Printed Access Card
9th Edition
ISBN: 9781305367425
Author: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher: Cengage Learning
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Chapter 17.5, Problem 1CYU
Solid Pbl2 (Ksp = 9.8 × 10‒9) is placed in a beaker of water. After a period of time, the lead(II) concentration is measured and found to be 1.1 × 10−3 M. Has the system reached equilibrium? That is, is the solution saturated? If not, will more Pbl2 dissolve?
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3) Propagation of uncertainty. Every measurement has uncertainty. In this problem, we'll
evaluate the uncertainty in every step of a titration of potassium hydrogen phthalate (a
common acid used in titrations, abbreviated KHP, formula CsH5KO4) with NaOH of an
unknown concentration.
The calculation that ultimately needs to be carried out is:
concentration NaOH
1000 x mass KHP × purity KHP
molar mass KHP x volume NaOH
Measurements:
a) You use a balance to weigh 0.3992 g of KHP. The uncertainty is ±0.15 mg (0.00015
g).
b) You use a buret to slowly add NaOH to the KHP until it reaches the endpoint. It takes
18.73 mL of NaOH. The uncertainty of the burst is 0.03 mL..
c) The manufacturer states the purity of KHP is 100%±0.05%.
d) Even though we don't think much about them, molar masses have uncertainty as well.
The uncertainty comes from the distribution of isotopes, rather than random
measurement error. The uncertainty in the elements composing KHP are:
a. Carbon:
b. Hydrogen:
±0.0008…
Don't used hand raiting and don't used Ai solution
How would you use infrared spectroscopy to distinguish between the following pairs of constitutional isomers?
(a)
CH3C=CCH3
||
and
CH3CH2C=CH
(b)
CH3CCH=CHCH3
and
CH3CCH2CH=CH2
Problem 12-41
The mass spectrum (a) and the infrared spectrum (b) of an unknown hydrocarbon are shown. Propose as many
structures as you can.
(a)
100
Relative abundance (%)
80
60
60
40
200
20
(b)
100
Transmittance (%)
10
20
20
80-
60-
40-
20
40
60
80
100
120
140
m/z
500
4000 3500
3000
2500
2000
1500
Wavenumber (cm-1)
1000
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