How do you write an acid/base reactions with phases? For example, including phases, write the chemical equation for the reaction of the weak acid HCN with water.

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How do you write an acid/base reactions with phases? For example, including phases, write the chemical equation for the reaction of the weak acid HCN with water.

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Answer 1 · 2016-08-07T12:19:29

$H C \equiv N (a q) + H_{2} O (l) ⇌ H_{3} O^{+} +^{-} C \equiv N$ $HC-=N(aq) + H_2O(l) rightleftharpoons H_3O^+ + ""^(-)C-=N$

$K_{a} = \frac{[H_{3} O^{+}] [^{-} C \equiv N]}{[H C \equiv N]} = 10^{- 9.21} at 298 K$ $K_a=([H_3O^+][""^(-)C-=N])/([HC-=N]) = 10^(-9.21)" at "298K$

Explanation:

Of course, the anions and the cations are solvated by, or aquated by, several water molecules. The acidium ion in water, which we represent as $H_{3} O^{+}$ $H_3O^+$ is likely to be a cluster of several water molecules, with an EXTRA $H^{+}$ $H^+$ ion, i.e. ${H_{9} O_{4}}_{9}^{+}$ ${H_9O_4}^+$ or something similar. The representation of this as $H^{+}$ $H^+$ or $H_{3} O^{+}$ $H_3O^+$ may even be naive, but it is still useful and practical for calculation.

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How do you write an acid/base reactions with phases? For example, including phases, write the chemical equation for the reaction of the weak acid HCN with water.

1 Answer

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