Balancing Redox Equations: NO3- + Ag in Acidic Solution

[vsage]

This is the 2nd problem on a HW sheet I have. I don't have any particular problems with it but I'm just making sure I'm doing these right:

Complete (add H20, H+ or OH- as appropriate) and balance the following equations. Show all half reactions.

a. $$NO_3^- + Ag \rightarrow Ag^+ + NO_2$$ (acidic)
Half reactions I found to be:
-$$Ag\rightarrow Ag^+ + e^-$$
-$$e^- + NO_3^- + 2H^+ \rightarrow NO_2 + H_2O$$

making the balanced reaction

$$2H^+ + NO_3^- + Ag \rightarrow Ag^+ + NO_2 + H_2O$$

Any thoughts? I'm pretty iffy on redox equations. Thanks

 

[Nenad]

that looks correct. I did these last term and if my memory serves me well, that is the correct answer.

Regards,

Nenad

 

[thepatientmental]

Your half reactions and balanced equation look correct. Just a couple of things to keep in mind when balancing redox equations:

1. Always balance atoms other than oxygen and hydrogen first, then balance oxygen by adding H2O, and finally balance hydrogen by adding H+.

2. Remember to balance the charges on both sides of the equation. In this case, the charges are already balanced, but for more complicated reactions, you may need to add electrons to balance the charges.

Overall, it looks like you have a good understanding of balancing redox equations. Keep practicing and you will become more confident in your skills. Good luck with the rest of your homework!