Tuesday

September 16, 2014

September 16, 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.

**Answer this Question**

**Related Questions**

chemistry - equilibrium Help - you observed that very little corrosion occurred ...

Social Studies 9 - I have to write a pamphlet for my teacher, the pamphlet is on...

Chemistry - Hi Dr. Bob, I am quite stumped on how to figure out when chemical ...

chem help - How do I find charges for ions of elements. Group 1 has 1+ charges, ...

7th grade math - I hope this makes sense, but my teacher said he wants all ...

Calculus I - Hi, I'm trying to figure this out, but the answer I keep coming up ...

math - I am supposed to use patterns or linear equation to fill in the graph but...

Social Studies - Was King Tut killed? My teacher said he was, but the my S.S. ...

Math help please - I'm so lost on this math Hw it's over factoring variables and...

chemistry A level - hello my teacher has really confused me. can anyone tell me ...