EXTRA CREDIT Chemistry B112 Due date: April 12, 2016 Chapter 18B/19 Take-home qu

Question

EXTRA CREDIT Chemistry B112 Due date: April 12, 2016 Chapter 18B/19 Take-home quiz You may use your book and notes and any other materials. Group study is allowed, but you may not receive help on specific questions from the quiz from any person. 1. A concentration cell is constructed with copper electrodes and Cu" in each compartment. In one compartment, the [Cu2+]-10% 10- M and in the other compartment, the [Cu = 2.0 M. Calculate the potential for this cell at 25°C What mass of Ni(s) may be deposited by electroplating from an aqueous NiCl, solution if a current of 2.50 A is applied to the solution for 365 s? 2. Give the electron configuration using the core Give the electron configuration using the core designation (abbreviated configuration) for 3. each of the following ions (e.g. [Ar]4s 3d'). Ni(lI) Mn(lI) C Give the correct IUPAC name for the following: (a) [MaCL(H 0)RjSO 4. (b) [Co(NH)sJCh

Explanation / Answer

1) Half reactions are:

Cu+2 --> Cu..... Eo = + 0.34 volts
Cu --> Cu+2 ..... Eo = - 0.34 volts

Eo for the reaction of Cu in both cells adds up to zero
Cu+2 & Cu --> Cu+2 & Cu
Using Nernst equation:
E = Eo - 0.0592/n (log Q)
E = zero - (0.0592 / 2 mol electrons)(log prod/reactants)
E = - 0.0296 log [1e-3] / [2]
E = - 0.0296 log 5e-4  
E = + 0.0977 volts
your answer(2sigffigs) = 0.098 volts

Please, post the other questions in another link to answer it.

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