In the presence of NH 3 , Cu 2+ forms the complex ion Cu(NH 3 ) 4 2+ . If the equilibrium concentrations of Cu 2+ and Cu(NH 3 ) 4 2+ are 1.8 × 10 −17 M and 1.0 × 10 −3 M , respectively, in a 1.5- M NH 3 solution, calculate the value for the overall formation constant of Cu(NH 3 ) 4 2+ . Cu 2+ ( a q ) + 4 N H 3 ( a q ) ⇌ C u ( N H 3 ) 4 2 + ( a q ) K overall = ?
In the presence of NH 3 , Cu 2+ forms the complex ion Cu(NH 3 ) 4 2+ . If the equilibrium concentrations of Cu 2+ and Cu(NH 3 ) 4 2+ are 1.8 × 10 −17 M and 1.0 × 10 −3 M , respectively, in a 1.5- M NH 3 solution, calculate the value for the overall formation constant of Cu(NH 3 ) 4 2+ . Cu 2+ ( a q ) + 4 N H 3 ( a q ) ⇌ C u ( N H 3 ) 4 2 + ( a q ) K overall = ?
Solution Summary: The author explains how the equilibrium constant is expressed by the formula, K=Concentration
In the presence of NH3, Cu2+ forms the complex ion Cu(NH3)42+. If the equilibrium concentrations of Cu2+ and Cu(NH3)42+ are 1.8 × 10−17M and 1.0 × 10−3M, respectively, in a 1.5-M NH3 solution, calculate the value for the overall formation constant of Cu(NH3)42+.
Cu
2+
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+
4
N
H
3
(
a
q
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⇌
C
u
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N
H
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4
2
+
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K
overall
=
?
a) A favorable entropy change occurs when ΔS is positive. Does the order of the system increase or decrease when ΔS is positive? (b) A favorable enthalpy change occurs when ΔH is negative. Does the system absorb heat or give off heat when ΔH is negative? (c) Write the relation between ΔG, ΔH, and ΔS. Use the results of parts (a) and (b) to state whether ΔG must be positive or negative for a spontaneous change. For the reaction, ΔG is 59.0 kJ/mol at 298.15 K. Find the value of K for the reaction.
A sample of hydrated magnesium sulfate (MgSO4⋅xH2O) is analyzed using thermogravimetric analysis (TGA). The sample weighs 2.50 g initially and is heated in a controlled atmosphere. As the temperature increases, the water of hydration is released in two stages: (a) The first mass loss of 0.72 g occurs at 150°C, corresponding to the loss of a certain number of water molecules. (b) The second mass loss of 0.90 g occurs at 250°C, corresponding to the loss of the remaining water molecules. The residue is identified as anhydrous magnesium sulfate (MgSO4) Questions: (i) Determine the value of x (the total number of water molecules in MgSO4⋅xH2O) (ii) Calculate the percentage of water in the original sample. Write down the applications of TGA.
The solubility product of iron(III) hydroxide (Fe(OH)3) is 6.3×10−38. If 50 mL of a 0.001 M FeCl3 solution is mixed with 50 mL of a 0.005 M NaOH solution, will Fe(OH)3 precipitate? Show all step-by-step calculations. To evaluate the equilibrium constant, we must express concentrations of solutes in mol/L, gases in bars, and omit solids, liquids, and solvents. Explain why.
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell