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Sulphide ions...

Question

Sulphide ions in alkaline solution react with solid sulphur to form polyvalent sulphide ions. The equilibrium constant for the formation of $S_{2}^{2 -}$ and $S_{3}^{2 -}$ from S and $S^{2 -}$ ions are 1.7 and 5.3 respectively. Equilibrium constant for the formation of $S_{3}^{- 2}$ from S is:

A

1.33

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B

3.11

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C

4.21

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D

1.63

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Solution

The correct option is B
3.11

$S + S^{- 2} ⇌ S_{2}^{- 2}; K_{1} - - - e q - 1$

$2 S + S^{- 2} ⇌ S_{3}^{- 2}; K_{2} - - - e q - 2$

_______________

$S + S_{2}^{- 2} ⇌ S_{3}^{- 2}; K_{3} - - - e q - 3$

$e q - 3 = - (e q - 1) + (e q - 2)$

$K_{3} = \frac{K_{2}}{K_{1}} = \frac{5.3}{1.7} = 3.11$

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Similar questions

Q. Sulphide ions in alkaline solution react with solid sulphur to form polyvalent sulphide ions. The equilibrium constant for the formation of

S_{2}^{2 -}

S_{3}^{2 -}

S^{2 -}

ions are 1.7 and 5.3 respectively. Calculate equuilibrium constant for the formation of

S_{3}^{2 -}

S_{2}^{2 -}

S

.

Q. Sulphide ion reacts with solid sulphur

S_{(a q)}^{2 -} + S_{(s)} ⇌ S_{2 (a q)}^{2 -}; K_{1} = 10

S_{(a q)}^{2 -} + 2 S_{(s)} ⇌ S_{3 (a q)}^{2 -}; K_{1}^{'} = 130

The equilibrium constant for the formation of

S_{3}^{2 -} (a q)

S_{2}^{2 -} (a q)

and sulphur is:

Q. Sulfide ion in alkaline solution reacts with solid sulfur to form polysulfide ions having formulae

S_{2}^{2 -}, S_{3}^{2 -}, S_{4}^{2 -}

and so on. The equilibrium constant for the formation of

S_{2}^{2 -}

12 (K_{1})

& for the formation of

S_{3}^{2 -}

132 (K_{1})

, both from S and

S^{2 -}

. What is the equilibrium constant for the formation of from

S_{3}^{2 -}

S_{2}^{2 -}

Q. Sulfide ion in alkaline solution reacts with solid sulfux to form polysulfide ions having formules

S_{2}^{- 2}, S_{3}^{2 -}, S_{4}^{2 -}

and so on. The equilibrium constant for the formation of

S_{2}^{2 -}

12 (K_{5})

& for the formulation of

S_{3}^{2 -}

132 (K_{2})

, both from S and

S^{2 -}

. What is the equilibrium content for the formation of

S_{3}^{2 -}

S_{2}^{2 -}

Q. In an alkaline solution, the following equilibria exist.

S^{2 -} + S \to S_{2}^{2 -}

equilibrium constant

K_{1}

S_{2}^{2 -} + S \to S_{3}^{2 -}

equilibrium constant

K_{2}

K_{1}

K_{2}

have the values 12 and 11, respectively.

S_{3}^{2 -} \to S^{2 -} + 2 S

. What is equilibrium constant for the reaction?

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