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From Yahoo Answers

Question:http://img525.imageshack.us/f/17063289.png/

Answers:SO32- + H2O = SO42- + 2 H+ + 2e- Cl2 + 2e- = 2 Cl- SO32- + Cl2 + H2O = SO42- + 2 Cl- + 2 H+ 2 IO3- + 12 H+ + 10e- = I2 + 6 H2O 2 I- = I2 + 2e- ) x 5 2 IO3- + 12 H+ + 10 I- = 6 I2 + 6 H2O divide by 2 IO3- + 6 H+ + 5 I- = 3 I2 + 3 H2O

Question:FeS + NO3- = Fe3+ + NO2 + S (please show work)

Answers:oxidation half reactions : Fe2+ = Fe3+ + 1e- S2- = S + 2e- reduction half reaction NO3- + 2 H+ + 1e- = NO2 + H2O ) x 3 3 NO3- + 6 H+ + 3 e- = 3 NO2 + 3 H2O Fe2+ = Fe3+ + 1e- S2- = S + 2e- ---------------------------------------------------------- 3 NO3- + 6 H+ + Fe2+ + S2- = 3 NO2 + Fe3+ + S + 3 H2O 3 NO3- + FeS + 6 H+ = Fe3+ + 3 NO2 + S + 3 H2O in acidic solution add 6 OH- on the left and on the right side ( 6 H+ + 6 OH- = 6 H2O) 3 NO3- + FeS + 3 H2O = Fe3+ + 3 NO2 + S + 6 OH- in alkaline solution

Question:In acidic solution, bromate ion can be used to react with a number of metal ions. One such reaction is BrO_3^{-}(aq) + Sn^2+(aq) --> Br^-(aq) + Sn^4+(aq) Since this reaction takes place in acidic solution, H_2O(l) and H^+(aq) will be involved in the reaction. Places for these species are indicated by the blanks in the following restatement of the equation: BrO_3^-(aq) + Sn^2+(aq) + _____ --> Br^-(aq) + Sn^4+(aq) + _____ QUESTION: What are the coeffcients for the six species including H2O and H?

Answers:For every O, add one H2O on the opposite side... THEN for every H, add one H+ on the opposite side.


From Youtube

Electrochemistry (Part 3) - Balancing Redox Reaction in Acidic Solution

In this video, we are going to balance a redox reaction that involves oxygen and hydrogen in an acidic solution. Please pay careful attention since this topic is EXTREMELY important.

Redox, Acid

How to balance a redox equation in acidic solution using the half-reaction method.

Electrochemistry (Part 2) - Balancing simple Redox Reaction

You will learn how to balance simple redox reaction by using the "half-reaction method."

Balancing Redox in Acidic Solution

Now that you know how to describe redox reactions and how to identify chemicals being oxidized and reduced, we can start to balance these reactions in acidic solution using the half-reaction method. www.bennettchemistry.com


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