Winter 2014 Q3

Moderators: Chem_Mod, Chem_Admin

heather_carlton_1K
Posts: 24
Joined: Wed Sep 21, 2016 2:56 pm

Winter 2014 Q3

Postby heather_carlton_1K » Tue Mar 14, 2017 11:27 pm

For question 3 on the Winter 2014 final exam how would you know which chemicals to pick for the galvanic cell without the voltage given?

Chem_Mod
Posts: 18400
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

Re: Winter 2014 Q3

Postby Chem_Mod » Wed Mar 15, 2017 2:36 pm

The voltage isn't given because in an earlier part of the question, you're asked to identify the chemicals required to build a galvanic cell with the HIGHEST possible voltage.

Jeannie_Kim_1I
Posts: 23
Joined: Fri Jul 15, 2016 3:00 am

Re: Winter 2014 Q3

Postby Jeannie_Kim_1I » Wed Mar 15, 2017 3:09 pm

The voltage values would probably be given either on that page of the exam or on a separate sheet of reduction reactions and their respective voltage values.

David Sung 2H
Posts: 15
Joined: Wed Sep 21, 2016 2:56 pm

Re: Winter 2014 Q3

Postby David Sung 2H » Fri Mar 17, 2017 9:25 pm

Why is Cu(NO3)2 not considered for making a galvanic cell? Does it not also have good conducting qualities since nitrates are soluble in water?

Absolute Zero 1O
Posts: 14
Joined: Wed Sep 21, 2016 2:56 pm

Re: Winter 2014 Q3

Postby Absolute Zero 1O » Sat Mar 18, 2017 3:53 pm

I assume reduction potentials must have been given. If you compare each of the E° for each of the half reactions and try to build a cell with highest E°, that would lead you to make those choices of chemicals given in the answer key.


Return to “Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams”

Who is online

Users browsing this forum: No registered users and 1 guest