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Ch.4 - Reactions in Aqueous Solution
All textbooksBrown 14th EditionCh.4 - Reactions in Aqueous SolutionProblem 58b
Chapter 4, Problem 58b

The following reactions (note that the arrows are pointing only one direction) can be used to prepare an activity series for the halogens:
Br2(aq) + 2 NaI(aq) → 2 NaBr(aq) + I2(aq)
Cl2(aq) + 2 NaBr(aq) → 2 NaCl(aq) + Br2(aq)
(b) Predict whether a reaction will occur when elemental chlorine and potassium iodide are mixed.

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1
Identify the halogens involved in the reactions: bromine (Br2), iodine (I2), and chlorine (Cl2).
Understand the concept of an activity series: it ranks elements based on their ability to displace other elements in compounds. A more active halogen can displace a less active halogen from its compound.
Analyze the given reactions to determine the relative activity of the halogens: In the first reaction, Br2 displaces I2, indicating that Br2 is more active than I2. In the second reaction, Cl2 displaces Br2, indicating that Cl2 is more active than Br2.
Based on the activity series derived from the reactions, determine the order of reactivity: Cl2 > Br2 > I2.
Predict the outcome of mixing elemental chlorine (Cl2) with potassium iodide (KI): Since Cl2 is more active than I2, Cl2 will displace I2 from KI, resulting in a reaction that forms KCl and I2.

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Textbook Question

The metal cadmium tends to form Cd2+ ions. The following observations are made: (i) When a strip of zinc metal is placed in CdCl2(aq), cadmium metal is deposited on the strip. (ii) When a strip of cadmium metal is placed in Ni(NO3)(aq), nickel metal is deposited on the strip. (a) Write net ionic equations to explain each of the preceding observations.

Textbook Question

The metal cadmium tends to form Cd2+ ions. The following observations are made: (i) When a strip of zinc metal is placed in CdCl2(aq), cadmium metal is deposited on the strip. (ii) When a strip of cadmium metal is placed in Ni(NO3)(aq), nickel metal is deposited on the strip. (b) Which elements more closely define the position of cadmium in the activity series?

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Textbook Question

The following reactions (note that the arrows are pointing only one direction) can be used to prepare an activity series for the halogens:

Br2(aq) + 2 NaI(aq) → 2 NaBr(aq) + I2(aq)

Cl2(aq) + 2 NaBr(aq) → 2 NaCl(aq) + Br2(aq)

(a) Which elemental halogen would you predict is the most stable, upon mixing with other halides?

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Textbook Question

(a) Is the number of moles of ions present in a solution an intensive or an extensive property?

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Textbook Question

(b) Can you identify which one between 0.10 mol ZnCl2 and 0.1M ZnCl2 contains more Zn2+ ion? Why?

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Textbook Question

You make 1.000 L of an aqueous solution that contains 35.0 g of sucrose (C12H22O11). (b) How many liters of water would you have to add to this solution to reduce the molarity you calculated in part (a) by a factor of two?

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