Chemistry for Changing Times
14th Edition
ISBN: 9780134212777
Author: John W. Hill; Terry W. McCreary
Publisher: Pearson Education (US)
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Question
Chapter 14, Problem 54P
Interpretation Introduction
Interpretation:
Whether the 0.50-L sample of drinking water is found to contain 4.0 µg of toluene exceeds the standards according to the table should be identified.
Concept introduction:
The below table suggests the standards for selected substances in drinking water according to the U.S. Environmental Protection Agency
| Substance | Maximum contamination level (mg/L) |
| Inorganic Primary standards | |
| Arsenic | 0.010 |
| Barium | 2 |
| Copper | 1.3 |
| Cyanide ion | 0.2 |
| Fluoride ion | 4.0 |
| Lead | 0.015 |
| Nitrate ion | 10b |
| Organic primary standards | |
| Atrazine | 0.003 |
| Benzene | 0.005 |
| p-Dichloromethane | 0.005 |
| Heptachlor | 0.0004 |
| Lindane | 0.0002 |
| Toluene | 1 |
| Trichloroethylene | 0.005 |
| Non-enforceable secondary standards | |
| Chloride ion | 250 |
| Iron | 0.3 |
| Manganese | 0.05 |
| Silver | 0.10 |
| Sulfate ion | 250 |
| Total dissolved solids | 500 |
| Zinc | 5 |
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3. Propose a synthesis for the following transformation. Do not draw an arrow-pushing
mechanism below, but make sure to draw the product of each proposed step (3 points).
CN
+ En
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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
Chapter 14 Solutions
Chemistry for Changing Times
Ch. 14 - Prob. 1RQCh. 14 - Why should foods be frozen swiftly rather than...Ch. 14 - Prob. 3RQCh. 14 - Prob. 4RQCh. 14 - Prob. 5RQCh. 14 - Prob. 6RQCh. 14 - Prob. 7RQCh. 14 - Prob. 8RQCh. 14 - Prob. 9RQCh. 14 - Prob. 10RQ
Ch. 14 - Prob. 11RQCh. 14 - Prob. 12PCh. 14 - What consequences does the lower density of ice...Ch. 14 - Prob. 14PCh. 14 - Prob. 15PCh. 14 - Prob. 16PCh. 14 - Prob. 17PCh. 14 - Prob. 18PCh. 14 - Prob. 19PCh. 14 - Prob. 20PCh. 14 - Prob. 21PCh. 14 - Prob. 22PCh. 14 - Prob. 23PCh. 14 - Prob. 24PCh. 14 - Prob. 25PCh. 14 - Prob. 26PCh. 14 - Prob. 27PCh. 14 - Prob. 28PCh. 14 - Prob. 29PCh. 14 - Prob. 30PCh. 14 - Prob. 31PCh. 14 - Prob. 32PCh. 14 - Prob. 33PCh. 14 - Prob. 34PCh. 14 - Prob. 35PCh. 14 - Prob. 36PCh. 14 - Prob. 37PCh. 14 - Prob. 38PCh. 14 - Prob. 39PCh. 14 - Prob. 40PCh. 14 - Prob. 41PCh. 14 - Prob. 42PCh. 14 - Prob. 43PCh. 14 - Prob. 44PCh. 14 - Prob. 45PCh. 14 - Prob. 46PCh. 14 - Prob. 47PCh. 14 - Prob. 48PCh. 14 - Prob. 49PCh. 14 - Prob. 50PCh. 14 - Prob. 51PCh. 14 - Prob. 52PCh. 14 - Prob. 53PCh. 14 - Prob. 54PCh. 14 - Prob. 55PCh. 14 - Prob. 56PCh. 14 - Prob. 57APCh. 14 - Prob. 58APCh. 14 - Prob. 59APCh. 14 - Prob. 60APCh. 14 - Prob. 61APCh. 14 - Prob. 62APCh. 14 - Prob. 63APCh. 14 - Prob. 64APCh. 14 - Prob. 65APCh. 14 - Prob. 66APCh. 14 - Prob. 67APCh. 14 - Prob. 68APCh. 14 - Prob. 69APCh. 14 - Prob. 70APCh. 14 - Prob. 71APCh. 14 - Prob. 14.1CTECh. 14 - Prob. 14.2CTECh. 14 - Prob. 14.3CTECh. 14 - Prob. 14.4CTECh. 14 - Prob. 14.5CTECh. 14 - Prob. 14.6CTECh. 14 - Prob. 14.7CTECh. 14 - Prob. 1CGPCh. 14 - Prob. 2CGPCh. 14 - Prob. 3CGPCh. 14 - Prob. 4CGPCh. 14 - Prob. 5CGPCh. 14 - Prob. 6CGPCh. 14 - Prob. 7CGPCh. 14 - Prob. 8CGPCh. 14 - Prob. 9CGPCh. 14 - Prob. 1CHQCh. 14 - Prob. 2CHQCh. 14 - Prob. 3CHQCh. 14 - Prob. 4CHQ
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