Calculation One

Instructions

Please attempt the calculation, then choose the best answer from those given and finally select the submit button to see whether you were correct.

Assume that in the reaction of Cu2+ with ammonia, the only complex ion to form is the tetraammine species, [Cu(NH3)4]2+.
Given a solution where the initial [Cu2+] is 0.10M, and the initial [NH3] is 1.0M and that beta4 = 2.1 x 10^13, calculate the equilibrium concentration of the Cu2+ ion.

  1. 7.9 x 10^-15
  2. 1.3 x 10^-14
  3. 3.7 x 10^-14
  4. 1.6 x 10^-11
  5. None of these, or I don't know.

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Feb-97, rjl