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A latimer diagram for sulfur in basic solution which one is unstable and disproportionation
Accepted Answer
The Latimer diagram for sulfur in basic solution is:
SO₄²⁻ → SO₃²⁻ → S₂O₃²⁻ → S → HS⁻ → H₂S
+0.94V +0.57V -0.45V -0.14V -0.28V
From the diagram, we can see that S₂O₃²⁻ is unstable because it has a positive potential to the right and a negative potential to the left. This means that it can disproportionate into SO₃²⁻ and S. The overall reaction is:
4S₂O₃²⁻ + 6OH⁻ → 2SO₃²⁻ + 3S + 3H₂O + 8e⁻
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