Laboratory Experiments For Chemistry: The Central Science, Si Edition
14th Edition
ISBN: 9781292221335
Author: Theodore E. Brown
Publisher: PEARSON
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Chapter 17, Problem 77E
A solution containing several metal ions is treated with dilute HCl; no precipitate forms. The pH is adjusted to about 1, and H2S is bubbled through. Again, no precipitate forms. The pH of the solution is then adjusted to about 8. Again, H2S is bubbled through. This time a precipitate forms. The filtrate from this solution is treated with (NH4)2HPO4. No precipitate forms. Which of these metal cations are either possibly present or definitely absent: Al3+, Na+, Ag+, Mg 2+?
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A mixture of sodium carbonate (Na2CO3) and sodium bicarbonate (NaHCO3) is dissolved in water and titrated with 0.100 M HCl. Methyl orange and phenolphthalein are employed for the titration. Methyl orange changes color from red to yellow between pH 3.1 and 4.4 with increasing pH, while phenolphthalein changes from colorless to red between pH 8.0 and 9.6 with increasing pH. 12.00 mL of HCl is required to reach the phenolphthalein end point in the titration of the mixture. The titration of a second aliquot of the mixture requires 34.00 mL of titrant to reach the methyl orange end point.
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You have a 15 mL sample of acetylcholine (a neurotransmitter) with an unknown concentration and a pH of 8.06. You incubate
this sample with the enzyme acetylcholinesterase to convert all of the acetylcholine to choline and acetic acid. The acetic acid
dissociates to yield acetate and hydrogen ions. At the end of the incubation period, you measure the pH again and find that it has
decreased to 5.91. Assuming there was no buffer in the assay mixture, determine the number of nanomoles of acetylcholine in
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O=
CH3
Acetylcholine
H₂O
CH,—C−O−CH,—CH,—*N-CH, → HO−CH,—CH,—*N–CH, + CH,—C−O + H*
CH3
CH 3
Choline
CH3
Acetate
You have a 18 mL sample of acetylcholine (a neurotransmitter) with an unknown concentration and a pH of 7.82. You incubate
this sample with the enzyme acetylcholinesterase to convert all of the acetylcholine to choline and acetic acid. The acetic acid
dissociates to yield acetate and hydrogen ions. At the end of the incubation period, you measure the pH again and find that it has
decreased to 5.66. Assuming there was no buffer in the assay mixture, determine the number of nanomoles of acetylcholine in
the original 18 mL sample. Tip: your answer should have two significant digits! Only the mantissa (the digits to the right of the
decimal) are significant when you raise a decimal number to a power.
CH,—C−O−CH,—CH,—*N—CH,
Acetylcholine
CH 3
acetycholine in original sample:
CH3
H₂O
CH3
HO–CH,—CH,—*N–CH, + CH,
Choline
CH3
CH, T
Acetate
O + H+
nmol
Chapter 17 Solutions
Laboratory Experiments For Chemistry: The Central Science, Si Edition
Ch. 17.1 - For the generic equilibrium HA(aq)H+(aq)+A(aq) ,...Ch. 17.1 - Practice Exercise 2 Calculate the pH of a solution...Ch. 17.1 - Calculate the concentration of the lactate ion in...Ch. 17.1 - Practice Exercise 2 Calculate the format ion...Ch. 17.2 - Practice Exercise 1 If the pH of a buffer solution...Ch. 17.2 - Prob. 17.3.2PECh. 17.2 - Prob. 17.4.1PECh. 17.2 - Prob. 17.4.2PECh. 17.2 - Calculate the number of grams of ammonium chloride...Ch. 17.2 - Prob. 17.5.2PE
Ch. 17.2 - Prob. 17.6.1PECh. 17.2 - Determine The pH of the original buffer described...Ch. 17.3 - An acid-base titration is performed: 250.0 mL of...Ch. 17.3 - Prob. 17.7.2PECh. 17.3 - Prob. 17.8.1PECh. 17.3 - Calculate the pH in the solution formed by adding...Ch. 17.3 - Prob. 17.9.1PECh. 17.3 - Prob. 17.9.2PECh. 17.4 - Which of these expressions correctly expresses the...Ch. 17.4 - Prob. 17.10.2PECh. 17.4 - You add 10.0 grams of solid copper(II) phosphate,...Ch. 17.4 - Prob. 17.11.2PECh. 17.4 - Prob. 17.12.1PECh. 17.4 - Prob. 17.12.2PECh. 17.5 - Consider a saturated solution of the salt MA3, in...Ch. 17.5 - Prob. 17.13.2PECh. 17.5 - Prob. 17.14.1PECh. 17.5 - Prob. 17.14.2PECh. 17.5 - Prob. 17.15.1PECh. 17.5 - Prob. 17.15.2PECh. 17.6 - An insoluble salt MA has a Kap of 1.0 × 10-10. Two...Ch. 17.6 - Does a precipitate form when 0.050 L of 2.0 × 10-2...Ch. 17.6 - Under what conditions does an ionic compound...Ch. 17.6 - Prob. 17.17.2PECh. 17 - Prob. 1DECh. 17 - The following boxes represent aqueos solutions...Ch. 17 - Prob. 2ECh. 17 - Prob. 3ECh. 17 - Prob. 4ECh. 17 - Prob. 5ECh. 17 - Prob. 6ECh. 17 - Prob. 7ECh. 17 - Prob. 8ECh. 17 - 17.9 The following graphs represent the behavior...Ch. 17 - Prob. 10ECh. 17 - 17.11 The graph below shows the solubility of a...Ch. 17 - 17.12 Three cations, Ni+2, Cu+2, and Ag+, are...Ch. 17 - Prob. 13ECh. 17 - Prob. 14ECh. 17 - Prob. 15ECh. 17 - Use information from Appendix D to calculate the...Ch. 17 - Prob. 17ECh. 17 - a. calculate the percent ionization of 0.125 M...Ch. 17 - Prob. 19ECh. 17 - 17.20 Which of the following solutions is a...Ch. 17 - Prob. 21ECh. 17 - Calculate the pH of a buffer that is 0.105n M in...Ch. 17 - Prob. 23ECh. 17 - A buffer is prepared by adding 10.0 g of ammonium...Ch. 17 - You are asked to prepare a pH = 3.00 buffer...Ch. 17 - You are asked to prepare an pH = 4.00 buffer...Ch. 17 - Prob. 27ECh. 17 - Prob. 28ECh. 17 - Prob. 29ECh. 17 - Prob. 30ECh. 17 - Prob. 31ECh. 17 - Prob. 32ECh. 17 - The accompanying graph shows the titration curves...Ch. 17 - Prob. 34ECh. 17 - 17.35 The samples of nitric and acetic acids shows...Ch. 17 - 17.36 Determine whether each of the following...Ch. 17 - Prob. 37ECh. 17 - Prob. 38ECh. 17 - Prob. 39ECh. 17 - Assume that 30.0 mL of a M solution of a week base...Ch. 17 - Prob. 41ECh. 17 - Prob. 42ECh. 17 - Prob. 43ECh. 17 - Prob. 44ECh. 17 - Prob. 45ECh. 17 - Consider the titration of 30.0 mL of 0.050 M NH3...Ch. 17 - Prob. 47ECh. 17 - Prob. 48ECh. 17 - 17.49 for each statement, incate whether it is...Ch. 17 - The solubility of two slighty soluble salts of...Ch. 17 - Prob. 51ECh. 17 - 17.52
a. true or false: solubility and...Ch. 17 - If the molar solubility CaF2 at 35 C is 1.24 *10-3...Ch. 17 - Prob. 54ECh. 17 - Prob. 55ECh. 17 - Prob. 56ECh. 17 - using calculate the molar solubility of AgBr in a....Ch. 17 - calculate the solubility of LaF3 in grams per...Ch. 17 - Prob. 59ECh. 17 - Consider a beaker containing a saturated solution...Ch. 17 - Calculate the solubility of Mn (OH) 2 in grams per...Ch. 17 - Calculate the molar solubility of Ni (OH) 2 when...Ch. 17 - 17.63 Which of the following salts will be...Ch. 17 - For each of the following slightly soluble salts,...Ch. 17 - Prob. 65ECh. 17 - Prob. 66ECh. 17 - Use values of Kap for Agl and Kf for Ag (CN) 2- to...Ch. 17 - Prob. 68ECh. 17 - Prob. 69ECh. 17 - Prob. 70ECh. 17 - Calculate the minimum pH needed to precipitate Mn...Ch. 17 - Prob. 72ECh. 17 - Prob. 73ECh. 17 - Prob. 74ECh. 17 - Prob. 75ECh. 17 - Prob. 76ECh. 17 - A solution containing several metal ions is...Ch. 17 - An unknown solid is entirely soluble in water. On...Ch. 17 - Prob. 79ECh. 17 - Prob. 80ECh. 17 - 17.81
Precipitation of the group 4 cautions of...Ch. 17 - Prob. 82ECh. 17 - Prob. 83AECh. 17 - Prob. 84AECh. 17 - Furoic acid (HC5H3O3) has a K value of 6.76 x 10-4...Ch. 17 - Prob. 86AECh. 17 - Equal quantities of 0.010 M solution of an acid HA...Ch. 17 - Prob. 88AECh. 17 - 17.89 A biochemist needs 750 ml of an acetic...Ch. 17 - A sample of 0.2140 g of an unknown monophonic acid...Ch. 17 - A sample of 0.1687 g of an unknown monoprotic acid...Ch. 17 - Prob. 92AECh. 17 - Prob. 93AECh. 17 - What is the pH of a solution made by mixing 0.30...Ch. 17 - Suppose you want to do a physiological experiment...Ch. 17 - Prob. 96AECh. 17 - Prob. 97AECh. 17 - For each pair of compounds, use Kap values to...Ch. 17 - Prob. 99AECh. 17 - Tooth enamel is composed of hydroxyapatite, whose...Ch. 17 - Salts containing the phosphate ion are added to...Ch. 17 - Prob. 102AECh. 17 - 17.103 The solubility –product constant for barium...Ch. 17 - Prob. 104AECh. 17 - Prob. 105AECh. 17 - A buffer of what pH is needed to give a Mg2+...Ch. 17 - The value of Kap for Mg3(AsO4)2 is 2.1 10-20 ....Ch. 17 - Prob. 108AECh. 17 - Prob. 109AECh. 17 - Prob. 110IECh. 17 - Prob. 111IECh. 17 - Prob. 112IECh. 17 - Prob. 113IECh. 17 - Prob. 114IECh. 17 - Prob. 115IECh. 17 - Prob. 116IECh. 17 - A concentration of 10-100 parts per billion (by...Ch. 17 - Prob. 118IECh. 17 - Prob. 119IECh. 17 - In nonaqueous solvents, it is possible to react HF...
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