The reaction of elemental sulfur (S_ 8 ) in an alkaline medium is represented by the equation: S_ 8(s) + aOH_ (aq) ^ - rightarrow bS_ (aq) ^ 2- + cS_ 2 O_ 3(aq) ^ 2- + dH_ 2 O_ (l) . Determine the stoichiometric coefficient 'a' required to balance this equation.

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EEJ MAIN Chemistry QUESTION #7191

Question 1

The reaction of elemental sulfur ($S_{8}$) in an alkaline medium is represented by the equation: $S_{8(s)} + aOH_{(aq)}^{-} \rightarrow bS_{(aq)}^{2-} + cS_{2}O_{3(aq)}^{2-} + dH_{2}O_{(l)}$. Determine the stoichiometric coefficient 'a' required to balance this equation.

12✔️
6
8
10

Correct Answer Explanation

This is a disproportionation reaction. The balanced equation in alkaline medium is:

$S_{8} + 12OH^{-} \rightarrow 4S^{2-} + 2S_{2}O_{3}^{2-} + 6H_{2}O$

Therefore, the value of the coefficient 'a' is $12$.

[cite: 13]

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