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L1 Acids and Bases

Definitions for AS90944 part B acids and bases

Acid A substance that is able to donate a hydrogen ion (proton).
Base A substance that is able to accept a hydrogen ion (proton). A basic solution contains hydroxide ions (OH-).
Alkali A base that is soluble in water
Indicator Substance that changes colour in the presence of acid or base.
Litmus Red litmus- acid → red Red litmus – base →blue; Blue litmus- acid →red Blue litmus – base →blue.
Universal indicator Mixture of indicators that change colour at different pH’s. pH 1→→→→→→→→→→→→→→→→→→→→→→→14; red --> orange→yellow→green→lilac →blue →purple.
pH A number that represents the concentration of the hydrogen ions in a solution.
pH scale A scale formed from the pH of different solutions.
Neutral Having a pH of 7, ie neither acidic nor basic.
Neutralisation Making an acidic solution less acidic or a basic solution less basic.
Antacids Substances that are taken to relieve stomach acidity.
Metal salts Ionic compounds except oxides or hydroxides.
Created by: kjsime