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Potassium Hydroxide

Potassium Hydroxide in Tradeasia

IUPAC Name

potassium; hydroxide

Cas Number

1310-58-3

HS Code

2815.20.00

Formula

Basic Info

Appearance

White Flakes

Common Names

Caustic potash, Potash lye, Potassium hydrate

Packaging

1000 @ 25 kg PP/PE bags, 25 MT / 20FCL

Brief Overview

Potassium Hydroxide is an odorless, white or slightly yellow color compound present either in crystal or liquid form and is composed of one potassium cation and one hydroxide anion. It is a chemical inorganic compound with formula KOH and is commonly known as Caustic Potash. It is a strong base along with sodium hydroxide, lithium hydroxide and few other metal hydroxides and it also resembles with sodium hydroxide in its chemical properties and applications. It is commercially sold as translucent pellets which sticky when exposed to air as it is hygroscopic in nature. KOH dissolves readily in water and this dissolution process is exothermic and it forms a strong alkaline caustic solution.

Manufactoring Process

Previously, it was created by adding potassium carbonate (potash) to a strong solution of calcium hydroxide (slaked lime), causing a metathesis reaction in which calcium carbonate precipitated, leaving potassium hydroxide in solution:

Ca(OH)2 + K2CO3 → CaCO3 + 2 KOH

Potassium hydroxide is obtained by filtering the precipitated calcium carbonate and boiling the solution. It was the primary method of producing potassium hydroxide until the late nineteenth century, when it was largely supplanted by the current method of electrolysis of potassium chloride solutions. The procedure is similar to that used to produce sodium hydroxide.

2 KCl + 2 H2O → 2 KOH + Cl2 + H2

On the cathode, hydrogen gas forms as a by-product, concurrently, anodic oxidation of the chloride ion occurs, producing chlorine gas as a by-product. This process requires the separation of the anodic and cathodic spaces in the electrolysis cell.

Previously, it was created by adding potassium carbonate (potash) to a strong solution of calcium hydroxide (slaked lime), causing a metathesis reaction in which calcium carbonate precipitated, leaving potassium hydroxide in solution:  

Ca(OH)2 + K2CO3 → CaCO3 + 2 KOH  

Potassium hydroxide is obtained by filtering the precipitated calcium carbonate and boiling the solution. It was the primary method of producing potassium hydroxide until the late nineteenth century, when it was largely supplanted by the current method of electrolysis of potassium chloride solutions. The procedure is similar to that used to produce sodium hydroxide.  

2 KCl + 2 H2O → 2 KOH + Cl2 + H 

On the cathode, hydrogen gas forms as a by-product; concurrently, anodic oxidation of the chloride ion occurs, producing chlorine gas as a by-product. This process requires the separation of the anodic and cathodic spaces in the electrolysis cell.

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