Making soaps, neutralize acids, making batteries and fuel cell.
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It's not a pesticide. this article has some good info on common usage
http://en.wikipedia.org/wiki/Potassium_hydroxide#Niche_applications
potassium ion and hydroxyl ion will be produced and solution is alkaline
Calcium Hydroxide & Ammonia Solution & Sodium Hydroxide. Are the Common Alkalis you find in a Lab
It is prepared by fusing sodium or potassium carbonate with sand or by heating sodium or potassium hydroxide with sand under pressure.
It forms a precipitate called sodium chloride and barium hydroxide, which both are colourless.
dilute: hydrochloric acid, sulphuric acid, nitric acid, sodium hydroxide, potassium hydroxide, ammmonia