The reaction of sulphur in alkaline medium is given below:
$S_{8 (s)} + a {OH}_{(aq)}^{-} \to b S_{(aq)}^{2 -} + c S_{2} O_{3 (aq)}^{2 -} + d H_{2} O_{(l)}$
The values of ' $a$ ' is______ (Integer answer)

Question

The reaction of sulphur in alkaline medium is given below: S 8 s + a OH aq − → b S aq 2 − + c S 2 O 3 aq 2 − + d H 2 O l The values of ' a ' is______ (Integer answer)

TestHub · Accepted Answer

For balancing in basic medium add equal number of ${OH}^{⊖}$ . That of $H^{+}$

$2 S_{8} + 12 H_{2} O + 24 {OH}^{⊖} ⟶ 8 S^{2 -} + 4 S_{2} O_{8}^{2 -} + 24 H_{2} O$

$2 S_{8} + 24 {OH}^{⊖} \to 8 S^{2 -} + 4 S_{2} O_{8}^{2 -} + 12 H_{2} O$

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

$a = 12$

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