Ch.16 - Aqueous Equilibrium WorksheetSee all chapters
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Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Copper(II) hydroxide, Cu(OH)2, has Ksp = 2.2 x 10 -20. For the reaction below, Keq = 4.0 x 10-7. What is Kf for Cu(NH3)42+?Cu(OH)2(s) + 4 NH3(aq) ⇋ Cu(NH3)42+(aq) + 2 OH -(aq)

Problem

Copper(II) hydroxide, Cu(OH)2, has Ksp = 2.2 x 10 -20. For the reaction below, Keq = 4.0 x 10-7. What is Kf for Cu(NH3)42+?

Cu(OH)2(s) + 4 NH3(aq) ⇋ Cu(NH3)42+(aq) + 2 OH -(aq)

Solution

We’re being asked to determine the formation constant of Cu(NH3)42+


We’re given the following reaction and equilibrium constant:

Cu(OH)2(s) + 4 NH3(aq)  Cu(NH3)42+(aq) + 2 OH(aq); Keq = 4.0 × 10–7


The Keq expression for this reaction is:


Keq=productsreactants=[Cu(NH3)42+][OH-]2[NH3]4


Note that solids and liquids are not included in the equilibrium expression and that each concentration is raised by the stoichiometric coefficient: [NH3] is raised to 4, [Cu(NH3)42+] is raised to 1, and [OH] is raised to 2.


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