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R-19
Part IV. The Determination of a Formation Constant
A.
Using the measured cell potential and the Nernst equation, calculate the [Cu
2+
] in the test solution.
(0.6 marks)
Answer: [Cu
2+
] = ____ _____
B.
Using an ICE table, calculate the equilibrium [NH3] in solution after the reaction to form
[Cu(NH3)
4
]
2+
has established equilibrium (~15-30 minutes). (1.0 marks)
C.
Using the [NH3], and the [Cu
2+
] that you obtained above, calculate the stability constant for
[Cu(NH3)
4
]
2+
(1.0 marks)
Answer: K
f
of Cu(NH3)
4
2+
= _____ ____
ASSESSMENT
Performance
(1.0 mark):
Laboratory Report
(9.0 marks):
Deductions
(if any):
