Balance equations
Post new topic Reply to topic
   Chemical Community Forum Index : Chemistry forum
View previous topic :: View next topic  
Author Message
studygives
Jr. Member
Jr. Member


Joined: 01 Jun 2020
Posts: 6
Reply with quoteFind all posts by studygives

Balance equations


balance

Last edited by studygives on Tue Jun 02, 2020 11:05 am; edited 1 time in total
Back to top
View user's profileSend private message
ChenBeier
Distinguished Member
Distinguished Member


Joined: 27 Sep 2017
Posts: 407
Location: Berlin, Germany
Reply with quoteFind all posts by ChenBeier


1. Build Redox pair CrCl3 /Na2CrO4 and H2O2/ OH-
2. Ions Cr3+/ CrO4 2- and H2O2/ OH-
3. Alkaline condition OH-
4. Cr3+ + 8 OH- => CrO4 2- + 4 H2O
5. Balance Electron
Cr3+ + 8 OH- => CrO4 2- + 4 H2O + 3 e-

H2O2 + 2 e-=> 2 OH-
Kgv = 6 for Elektrons

2 Cr3+ 16 OH-=> 2 CrO4 2- + 8 H2O + 6 e-

3 H2O2 + 6 e- => 6 OH-

Addition

2 Cr3+ 10 OH- + 3 H2O2 => 2 CrO4 2- + 8 H2O
Adding Na+ + Cl-

2 CrCl3+ 10 NaOH+ 3 H2O2 => 2 Na2CrO4 + 8 H2O + 6 NaCl
Finished


Last edited by ChenBeier on Mon Jun 01, 2020 1:46 pm; edited 2 times in total
Back to top
View user's profileSend private message
studygives
Jr. Member
Jr. Member


Joined: 01 Jun 2020
Posts: 6
Reply with quoteFind all posts by studygives


I didn't understand what is being done
Back to top
View user's profileSend private message
ChenBeier
Distinguished Member
Distinguished Member


Joined: 27 Sep 2017
Posts: 407
Location: Berlin, Germany
Reply with quoteFind all posts by ChenBeier


What do you don't understand? You have to pick the oxidation and Reduction Compounds on both side of the equation.
According it is alkaline ( NaOH) you add OH- on edukt side and get water on product side
Balance and add electrons for the balanced charge,
Then for both equation you get the electrons equal .
Then Addition of both equation, electrons and some water will be eliminated.
At the end you add the spectator ions sodium and chloride.
Back to top
View user's profileSend private message
virlumar
Newbie
Newbie


Joined: 03 Jun 2020
Posts: 1
Reply with quoteFind all posts by virlumar


¿Como de balancea esta ecuación FeCl3 + CaSO3 = CaCl2 + FeSO2?
Back to top
View user's profileSend private message
ChenBeier
Distinguished Member
Distinguished Member


Joined: 27 Sep 2017
Posts: 407
Location: Berlin, Germany
Reply with quoteFind all posts by ChenBeier


2 FeCl3 + H2O + CaSO3 => 2 FeCl2 + CaSO4 + 2 HCl
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