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November 26, 2014

November 26, 2014

Posted by **Laura** on Tuesday, May 24, 2011 at 3:59pm.

If someone could help it would be muchly appeciated!

Experiments were performed with four metals and solutions of their ions: A-A, B-B2+, C-C2+, D-D2+. the results of the experiments were:

D2 + C = No reactions

B2 + C = B + C2

A + B = A + B2

a) write the equation for each reduction half reaction.

b) Arrange them in the relative reduction potential table with the easiest to reduce at the top and the hardest at the bottom.

c) write the equation for each ocidation half reaction.

d) Arrange them in the relative oxidation potential table with the easiest to oxidixe at the top and the hardest at the bottom.

e) Which is the best oxidixing agent? which is the best reducing agent??

- Chemistry -
**DrBob222**, Tuesday, May 24, 2011 at 5:11pmI think you have made typos or just didn't write some of the problem?

Is A-A really A-A^+ or A-A^2+ or something similar to the other pairs?

In the reactions, is the first one of

D2 + C==>NR really D^2+ + C ==> NR?

Is the second one of

B2 + C ==> B + C2 really B^2+ + C ==>B + C^2+?

etc.

- Chemistry -
**Laura**, Tuesday, May 24, 2011 at 5:15pmA-A^+

D^2+ + C = No Reactions

B^2+ + C = B C^2

A^+ + B = A + B^2+

- Chemistry -
**DrBob222**, Tuesday, May 24, 2011 at 5:58pmArrange these couples in pairs something like the following where the first column is the metal(element) and the second column is the ion:

.....M.......ion

.....A.......A^+

.....B.......B^2+

.....C.......C^2+

.....D.......D^2+

Now remember the activity series. Here is a link to remind you of what it looks like.

http://www.files.chem.vt.edu/RVGS/ACT/notes/activity_series.html

In the activity series, any ELEMENT will replace any ION BELOW IT IN THE SERIES but will NOT replace an ion ABOVE it in the series. For example,

2Na + HCl ==> 2NaCl + H2. Notice that Na is ABOVE H^+ so the reaction goes as written. But Cu will not replace H^+ as

Cu + 2HCl ==> CuCl2 + H2 IS NOT CORRECT. WHY? Because Cu is BELOW H^+ in the series (find them so you can see what is going on) so the correct equation to write is

Cu + HCl ==> No reaction.

Now to your post.

D^2+ + C ==> No reaction which means that C (the element) is BELOW D^2+; therefore, in a new table you can write them like this.

.........M..............ion

.........D..............D^2+

.........C..............C^2+

From rxn 2 (B^2+ + C==> B + C^2+) you know C(the element) must be ABOVE B and you can add it to the table just below C like this.

.........M..............ion

.........D..............D^2+

.........C..............C^2+

.........B..............B^2+

The last equation of A^+ + B ==> A + B^2+ means B must be ABOVE A so it goes at the bottom of the table. The final table should look like this

D

C

B

A.

Now that they are lined up right, you can answer the other questions.

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