Balance Reaction Using Oxidation States Method
Post new topic Reply to topic
   Chemical Community Forum Index : Chemistry forum
View previous topic :: View next topic  
Author Message
romihan95
Newbie
Newbie


Joined: 21 Mar 2020
Posts: 1
Reply with quoteFind all posts by romihan95

Balance Reaction Using Oxidation States Method


I need help balancing this reaction on my chemistry homework, please!

Must be done using oxidation states method

NO3^- + Zn +OH^- + H2O = Zn(OH)4^2- + NH3
Back to top
View user's profileSend private message
ChenBeier
Distinguished Member
Distinguished Member


Joined: 27 Sep 2017
Posts: 353
Location: Berlin, Germany
Reply with quoteFind all posts by ChenBeier


In alkaline envirement oxidation by adding of OH- on educt side and water on product side, if oxygen is involved ,by reduction vise versa.

Look for redox pairs

Redox pair NO3- / NH3 and Zn/ [Zn( OH)4]2-

NO3- + 6 H2O => NH3 + 9 OH- add water and OH-

Zn + 4 OH- => [Zn(OH)4]2- only add OH- no oxygen transfer.

Balance charges by using electrons

NO3- + 6 H2O + 8 e- => NH3 + 9 OH- Reduction

Zn + 4 OH- => [Zn(OH)4]2- + 2 e- Oxidation

kgV of electron is 8

Multiplication of second equation by 4

4 Zn + 16 OH- => 4 Zn(OH)4]2- + 8 e-

Addition

4 Zn + NO3- + 6 H2O + 7 OH- => 4 [Zn(OH)4]2- + NH3
Back to top
View user's profileSend private message
Display posts from previous:   
Post new topic Reply to topic
   Chemical Community Forum Index : Chemistry forum Page 1 of 1

 
Jump to:  

Chemical portal