Chapter 4: Problem 147
Appendix E describes a useful study aid known as concept mapping. Using the method presented in Appendix \(\mathrm{E},\) construct a concept map relating the topics found in Sections \(4-3,4-4,\) and \(4-5\).
Chapter 4: Problem 147
Appendix E describes a useful study aid known as concept mapping. Using the method presented in Appendix \(\mathrm{E},\) construct a concept map relating the topics found in Sections \(4-3,4-4,\) and \(4-5\).
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Get started for freeA mixture contains only \(\mathrm{CuCl}_{2}\) and \(\mathrm{FeCl}_{3}\). A \(0.7391 \mathrm{g}\) sample of the mixture is completely dissolved in water and then treated with \(\mathrm{AgNO}_{3}(\) aq). The following reactions occur. $$\begin{aligned} &\mathrm{CuCl}_{2}(\mathrm{aq})+2 \mathrm{AgNO}_{3}(\mathrm{aq}) \longrightarrow 2 \mathrm{AgCl}(\mathrm{s})+\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq}) \end{aligned}$$ $$\begin{aligned} &\mathrm{FeCl}_{3}(\mathrm{aq})+3 \mathrm{AgNO}_{3}(\mathrm{aq}) \longrightarrow 3 \mathrm{AgCl}(\mathrm{s})+\mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{3}(\mathrm{aq})\end{aligned}$$ If it takes \(86.91 \mathrm{mL}\) of \(0.1463 \mathrm{M} \mathrm{AgNO}_{3}\) solution to precipitate all the chloride as \(\mathrm{AgCl}\), then what is the percentage by mass of copper in the mixture?
How much (a) ethanol, \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}(d=0.789 \mathrm{g} / \mathrm{mL}),\) in liters, must be dissolved in water to produce \(200.0 \mathrm{L}\) of 1.65 \(\mathrm{M} \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} ?\) (b) concentrated hydrochloric acid solution \((36.0 \%\) HCl by mass; \(d=1.18 \mathrm{g} / \mathrm{mL}),\) in milliliters, is required to produce 12.0 L of 0.234 M HCl?
A sulfide of iron, containing \(36.5 \%\) S by mass, is heated in \(\mathrm{O}_{2}(\mathrm{g}),\) and the products are sulfur dioxide and an oxide of iron containing \(27.6 \%\) O, by mass. Write a balanced chemical equation for this reaction.
Baking soda, \(\mathrm{NaHCO}_{3}\), is made from soda ash, a common name for sodium carbonate. The soda ash is obtained in two ways. It can be manufactured in a process in which carbon dioxide, ammonia, sodium chloride, and water are the starting materials. Alternatively, it is mined as a mineral called trona (left photo). Whether the soda ash is mined or manufactured, it is dissolved in water and carbon dioxide is bubbled through the solution. Sodium bicarbonate precipitates from the solution. As a chemical analyst you are presented with two samples of sodium bicarbonate-one from the manufacturing process and the other derived from trona. You are asked to determine which is purer and are told that the impurity is sodium carbonate. You decide to treat the samples with just sufficient hydrochloric acid to convert all the sodium carbonate and bicarbonate to sodium chloride, carbon dioxide, and water. You then precipitate silver chloride in the reaction of sodium chloride with silver nitrate. A \(6.93 \mathrm{g}\) sample of baking soda derived from trona gave \(11.89 \mathrm{g}\) of silver chloride. A \(6.78 \mathrm{g}\) sample from manufactured sodium carbonate gave \(11.77 \mathrm{g}\) of silver chloride. Which sample is purer, that is, which has the greater mass percent \(\mathrm{NaHCO}_{3} ?\)
In the decomposition of silver(I) carbonate to form metallic silver, carbon dioxide gas, and oxygen gas, (a) one mol of oxygen gas is formed for every 2 mol of carbon dioxide gas; (b) 2 mol of silver metal is formed for every 1 mol of oxygen gas; (c) equal numbers of moles of carbon dioxide and oxygen gases are produced; (d) the same number of moles of silver metal are formed as of the silver(I) carbonate decomposed.
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