Quá trình khử : (S0 + 2 e ---> S-2 ) * 2
Quá trình OXH: (S0 ---> S+4 + 4e) *1
--> 3S0 ---> 2 S-2 + S+4
----> 3S + 4 KOH ---> 2 K2S + K2SO3 + 2 H2O
S + KOH -> K2S + K2SO3 + H2O
1x | \(S^0\rightarrow S^{+4}+4e\)
2x |\(S^0+2e\rightarrow S^{-2}\)
\(\Rightarrow\) 3S + 6KOH -> 2K2S + K2SO3 + 3H2O