Page 1 of 1

Finding Q

Posted: Wed Mar 04, 2020 11:13 pm
by TimVintsDis4L
When we are given a Cell Diagram and concentrations and asked to find the Q what do we use as the Products and Reactants. Would we not use the right side (cathode, reduced) side as the Product and the (anode,oxidized) side as the Reactant?

Re: Finding Q

Posted: Wed Mar 04, 2020 11:17 pm
by Renee Grange 1I
You can write the total reaction to see what the products and reactions are. But, I believe the anode is usually the product and the cathode usually the reactant.

Re: Finding Q

Posted: Thu Mar 05, 2020 12:37 am
by Brooke Yasuda 2J
Yes, the anode is the product and the cathode is the reactant. This makes sense because in the anode the concentrations of reactant are decreasing as it forms product in the cathode.

Re: Finding Q

Posted: Thu Mar 05, 2020 10:24 am
by Mandeep Garcha 2H
Q=anode/cathode. So you can plug in all the values you know for the equation and solve for the unknown.

Re: Finding Q

Posted: Fri Mar 06, 2020 12:11 am
by Anthony Hatashita 4H
Q is anode/cathode usually. You can write out the full reaction equation to verify on a case to case basis.

Re: Finding Q

Posted: Fri Mar 06, 2020 12:13 am
by Sanjana Borle 2K
Since you flip the equation for the anode when writing out the total equation for a cell, it makes sense that Q would be anode/cathode because this way the anode becomes the product.

Re: Finding Q

Posted: Fri Mar 06, 2020 7:26 am
by Juana Abana 1G
Brooke Yasuda 2J wrote:Yes, the anode is the product and the cathode is the reactant. This makes sense because in the anode the concentrations of reactant are decreasing as it forms product in the cathode.



So then the anode is always the product and the cathode is always the reactant?

Re: Finding Q

Posted: Fri Mar 06, 2020 7:50 am
by Jasmine Kim 1L
Juana Abana 1G wrote:So then the anode is always the product and the cathode is always the reactant?

In most cases, yes, but I would always write out the reaction to be sure.