Chem / RedOx question

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1

long shot but ive been up all night doing hmwk, this is the last problem and im like :bloated: right now, not sure where im fuckin up here…:gotme:

Balance the RedOx Rxn: As2O3 + NO3- —> H3AsO4 + N2O3

1/2 reactions:

4e- + AS2O3 + 5H20 —> 2H3AsO4 + 4H+

and

2NO3- + 3H+ —> N2O3 + 3H2O + 1e-

So here’s my question: Can I multiply the 2nd 1/2 rxn by 4 and the top by 1? Cuz when I do that and cancel out, the Hydrogens don’t balance out…

(4e- + AS2O3 + 5H20 —> 2H3AsO4 + 4H+) x 1
(2NO3- + 3H+ —> N2O3 + 3H2O + 1e-) x 4

4e- + AS2O3 + 5H20 —> 2H3AsO4 + 4H+
8NO3- + 12H+ ----> 4N2O3 + 12H20 + 4e-

cancel out

8NO3- + AS2O3 + 8H+ ----> 4N2O3 + 2H3AsO4 + 7H20

8 H on the left, 20 on the right?? :wtf:

2

I hated that class. And it was too long ago for me to remember, 943kgt might have better understanding, he paid more attention than me throughout the chemistry classes.

3

yeah i hate it too. stupid numbers.

4

gen chem?

5

meh I got it. friggin coeff in front of H2 got me.

I corrected it in case anyone cares. And yeah, gen/inorganic part 2

6

I liked general chem!

7

for some reason gen. chem was really hard for me at UB lol maybe its because i didn’t take chem in highschool

orgo on the other hand was a cake walk

8

FUCK gen, and FUCK orgo, and FUCK analytical

9

Analytical with Colòn? That class wasn’t bad. Breaking up the lecture and lab so much seems really illogical, probably because it is. That class structure is the reason I switched from Chemistry to Chemical Engineering.

10

my whole class did terrible on kinetics and acid/base equilibira … i got a 77 on the midterm and that was the 3rd highest grade :bloated: then again its a community college, the teacher isn’t all that great, and the kids aren’t all that bright

11

I am taking analytical w/ Aga right now. She’s a good teacher I like her. Currently A in the class. We’ll see after finals lol

12

An azn having trouble with math and science? That’s like the proverbial black dude with a small package. That sucks.

13

Have fun with King/Coppens for Physical Chemistry. So glad I’m done with that department.

14

you just have to follow the steps for this…

http://preparatorychemistryonline.com/Bishop_Balancing_Redox.htm

Try reading through this

OR

try reading

:wink:

15

way to read the thread, i figured it out 45 min later after i got to school and re-did it…stalker