1 / 8

Balancing redox reactions

Pg 646 - 651. Balancing redox reactions. Balancing Redox Reaction. Can use “old” way: Ag (s) + Fe(NO3)3 ( aq )  Fe (s) + AgNO3 ( aq ) But what if we have a reaction that looks like this…. MnO4- ( aq ) + Fe2+ ( aq ) Fe3+ ( aq ) + Mn2+ ( aq ). acid. Half-Reaction Method.

britain
Download Presentation

Balancing redox reactions

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Pg 646 - 651 Balancing redox reactions

  2. Balancing Redox Reaction • Can use “old” way: Ag (s) + Fe(NO3)3 (aq)  Fe (s) + AgNO3 (aq) • But what if we have a reaction that looks like this…. MnO4- (aq) + Fe2+ (aq) Fe3+ (aq) + Mn2+ (aq) acid

  3. Half-Reaction Method • Separate the reaction into an oxidation half-reaction and a reduction half-reaction. • Balance ANY atom that isn’t an H or O in each reaction using coefficients.

  4. Half-Reaction Method • Balance any O’s by adding water to the opposite side of the half-reaction. • Balance any H’s by adding H+ to the opposite side of the reaction.

  5. Half-Reaction Method • Add electrons to each half-reaction so that the charges on both sides of the reaction are the same. • Balance the total number of electrons so they are EQUAL in both reactions.

  6. Half-Reaction Method • Add the two half-reactions together • Check to make sure the atoms and charges balance!!

  7. Let’s try one more!! • Balance the following redox reaction using the half-reaction method: Pb (s) + PbO2 (s) + H+ (aq)  Pb2+ (aq) + H2O (l)

  8. Now you try one!! Balance the following reaction using the half-reaction method: Ni (s) + NO3- (aq)  Ni2+ (aq) + NO2 (g)

More Related