Question

Balance the reaction As2S3 + KMnO4 + H2SO4 - K2SO4 + MnO + SO2 + As2O5

Answer 1

Answer:

4 As2S3 + 22 KMnO4 + 0 H2SO4 = 11 K2SO4 + 22 MnO + SO2 + 4 As2O5

Answer 2

it can be solved easily with help of half reaction method :

step 1 : first balance As2S3, SO2 and As2O5 . see the below reaction...

$As_2S_3+11H_2O\rightarrow 3SO_2+As_2O_5+22H^++22e^-$.....(1)

step 2 : Now balance KMnO4, H2SO4, K2SO4 and MnO.

$2KMnO_4+H_2SO_4+10H^++10e^-\rightarrow K_2SO_4+2MnO+6H_2O$ .......(2)

step 3 : multiplying 11 with equation (2) and 5 with equation (1)

$22KMnO_4+11H_2SO_4+110H^++110e^-\rightarrow11K_2SO_4+22MnO+66H_2O$.....(2)

$5As_2S_3+55H_2O\rightarrow15SO_2+5As_2O_5+110H^++110e^-5$ .....(1)

step 4: adding equations (1) and (2) to get balanced chemical reaction.

$22KMnO_4+11H_2SO_4+5As_2S_3\rightarrow11K_2SO_4+22MnO+11H_2O+15SO_2+5As_2O_5$ This is required balanced chemical equation.