Why don't we write $K (s) + 2 H_{2} O (l) \to K {(O H)}_{2} (a q) + \frac{1}{2} H_{2} (g)$ $K(s) + 2H_2O(l)rarr K(OH)_2(aq) + 1/2H_2(g)$ ?

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Why don't we write $K (s) + 2 H_{2} O (l) \to K {(O H)}_{2} (a q) + \frac{1}{2} H_{2} (g)$ $K(s) + 2H_2O(l)rarr K(OH)_2(aq) + 1/2H_2(g)$ ?

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Answer 1 · 2017-05-24T17:18:33

Because it does not follow the experiment.............

Explanation:

$Potassium metal$ $"Potassium metal"$ is oxidized by water to give $potassium hydroxide$ $"potassium hydroxide"$ and $dihydrogen gas$ $"dihydrogen gas"$ :

$K (s) + H_{2} O (l) \to K O H (a q) + \frac{1}{2} H_{2} (g) ↑ ⏐ ⏐ ⏐$ $K(s) +H_2O(l) rarr KOH(aq) + 1/2H_2(g) uarr$

And given the experiment, we would find half an equiv of dihydrogen gas evolved per equiv of metal, and one equiv of hydroxide in solution. Both results could be easily confirmed by experiment.

A species such $K {(O H)}_{2}$ $K(OH)_2$ is UNKNOWN............and is likely to remain unknown given that it contains a $K^{2 +}$ $K^(2+)$ species, an unknown ion.

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Why don't we write $K (s) + 2 H_{2} O (l) \to K {(O H)}_{2} (a q) + \frac{1}{2} H_{2} (g)$ $K(s) + 2H_2O(l)rarr K(OH)_2(aq) + 1/2H_2(g)$ ?

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Why don't we write K(s)+2H2O(l)→K(OH)2(aq)+12H2(g)K(s) + 2H_2O(l)rarr K(OH)_2(aq) + 1/2H_2(g)?

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Why don't we write $K (s) + 2 H_{2} O (l) \to K {(O H)}_{2} (a q) + \frac{1}{2} H_{2} (g)$ $K(s) + 2H_2O(l)rarr K(OH)_2(aq) + 1/2H_2(g)$ ?