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L1 Acids and Bases
Definitions for AS90944 part B acids and bases
Term | Definition |
---|---|
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. |