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Oxidation Number Method

Which equatio...

Question

Which equation represents charge balanced equation for a solution of $H_{2} S$ in water?

A

[H^{+}] = 2 [S^{2 -}] + [H S^{-}] + [O H^{-}]

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B

[H^{+}] = [O H^{-}]

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C

[H^{+}] = [S^{2 -}] + [H S^{-}] + [H^{+}]

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D

[H^{+}] = [S^{2 -}] + [H S^{-}] + [O H^{-}]

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Solution

The correct option is D $[H^{+}] = 2 [S^{2 -}] + [H S^{-}] + [O H^{-}]$
In solution,
$H_{2} O \to H^{+} + O H^{-}$
$H_{2} S \to H^{+} + H S^{-} + S^{- 2}$
In solution, total positive charge from all species is equal to total negative charge from all species.
$[H^{+}] = 2 [S^{2 -}] + [H S^{-}] + [O H^{-}]$

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Similar questions

K_{a 1}, K_{a 2}

K_{a 3}

are the respective ionisation constants for the following reactions;

H_{2} S ⇌ H^{+} H S^{-}

H S^{-} ⇌ H^{+} S^{2 -}

H_{2} S ⇌ 2 H^{+} S^{2 -}

The correct relationship between

K_{a 1}, K_{a 2}

K_{a 3}

Q. Consider the reaction:

{C l}_{2} (a q .) + H_{2} S (a q .) ⟶ S (s) + 2 H^{+} (a q .) + 2 {C l}^{-} (a q .)

The rate equation for this reaction is:
Rate

= k [{C l}_{2}] [H_{2} S]

Which of these mechanisms is/are consistent with this rate equation?

A

{C l}_{2} + H_{2} S ⟶ H^{+} + {C l}^{-} + {C l}^{+} + H S^{-}

{C l}^{+} + H S^{-} ⟶ H^{+} + {C l}^{-} + S

B

H_{2} S ⇌ H^{+} + H S^{-}

(fast equilibrium)

{C l}_{2} + H S^{-} ⟶ 2 {C l}^{-} + H^{+} + S

Q. Consider the reaction :

C l_{2} (a q) + H_{2} S (a q) \to S (s) + 2 H^{+} (a q) + 2 C l^{-} (a q)

The rate equation for this reaction is

= k [C l_{2}] [H_{2} S]

Which of these mechanisms

i s / a r e

consistent with this rate equation?
(A)

C l_{2} + H_{2} S \to H^{+} + C l^{-} + C l^{+} + H S^{-}

C l^{+} + H S^{-} \to H^{+} + C l^{-} + S

H_{2} S \Leftrightarrow H^{+} + H S^{-}

(fast equilibrium)

C l_{2} + H S^{-} \to 2 C l^{-} + H^{+} + S

H_{2} O (l) + S^{2 -} ⇌ {H S}^{-} + {O H}^{-}

In the equation for the reaction represented above, the species acting as acids (proton donors) are:

H S^{-} + O H^{-} \to S^{2 -} + H_{2} O

In the system indicated by the equation above, brosnted acids are:

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