What is the electrolysis of concentrated potassium chloride in aqueous solutions?

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What is the electrolysis of concentrated potassium chloride in aqueous solutions?

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Answer 1 · 2017-06-19T22:41:51

It means the charge is taken away from the potassium and chloride ions at the electrodes.

Explanation:

The solution may be represented by $K^{+} (a q) and C l^{-} (a q)$ $K^+(aq) and Cl^(-)(aq)$

At the positive electrode (anode) the following happens:
$C l^{- \to} C l + e^{-}$ $Cl^- ->Cl+e^-$
$2 C l \to C l_{2} (g)$ $2Cl->Cl_2(g)$

At the other side (cathode):
$K^{+} + e^{-} \to K$ $K^+ +e^(-) ->K$
$K + H_{2} O \to K^{+} + O H^{- +} H$ $K+H_2O->K^+ +OH^- +H$
$2 H \to H_{2} (g)$ $2H->H_2(g)$

So the net result is that at the anode chlorine gas is released, at the cathode hydrogen gas is released, and a strong solution of potassium hydroxide is left in the container:

$2 K C l (a q) + 2 H_{2} O \to 2 K O H (a q) + H_{2} (g) + C l_{2} (g)$ $2KCl(aq)+2H_2O->2KOH(aq)+H_2(g)+Cl_2(g)$

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What is the electrolysis of concentrated potassium chloride in aqueous solutions?

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