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December 20, 2014

December 20, 2014

Posted by **Christie** on Tuesday, November 17, 2009 at 6:44pm.

- electrochemistry -
**DrBob222**, Tuesday, November 17, 2009 at 7:15pmPart of the reason for confusion may be that there is no oxygen in any of your work except in the explanation. Here is a site that will help you determine the oxidation state of almost anything.

http://www.chemteam.info/Redox/Redox-Rules.html

For PdCl4^-2:

Cl is -1. There are 4 of them for a total of -4. So what must Pd be in order to leave a -2 charge on the ion. Obviously, Pd must be +2.

Let's check it. +2 for Pd, -4 for Cl, total is +2 + (-4) = -2.

So PdCl4^-2 + 2e ==> Pd + 4Cl^-

You can balance this another way without knowing the oxidation state for Pd but I don't recommend it because it doesn't teach oxidation numbers and you need that for later. However, here is how you do it.

Write the half reaction from what is given.

PdCl4^-2 ==> Pd + 4Cl^-

Now count the charge on the left and right. On the left I see -2. On the right I see -4. So we add electrons to the left to make it balance, like this.

PdCl4^-2 + ?e ==> Pd + 4Cl^-

How many electrons must we add so we have -4 on both sides. Of course, that is 2e. So we have

PdCl4^-2 + 2e ==> Pd + 4Cl^-

-4 = -4

Works every time.

For the Cd.

Cd ==> Cd^+2 + 2e

I hope this helps you get unconfused.

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