Chemistry - acids and alkalis

Properties

Acids

-Liquid -Sour taste -Contain hydrogen ions -PH less than 7 -Turns universal indicator from green to red -Reacts to metals to form salts -Turns blue litmas paper red -When concentrated can be corrosive -Solutions of compunds in water

Examples of acids - Lemon juice(citric acid), vinegar(ethanoic acid)

magnesium + hydrochloric acid -> magnesium chloride + hydrogen gas

Alkalis

-Soapy to touch -Soluble base -Can burn skin -Turn red litmus blue -Contain hydroxide ions -Bitter taste -Turns universal indicator from green to purple or blue

pH Scale

0-6 is acid the smaller the number the stronger the acid 8-14 alkalis the higher the number the stronger the alkalis -7 neutral

Red is acid Green is neutral Purple is alkalis

pH Scale

0-6 is acid the smaller the number the stronger the acid 8-14 alkalis the higher the number the stronger the alkalis -7 neutral

Red is acid Green is neutral Purple is alkalis

Neutralisation

When acid reacts with an alkalis is produces salt and water, this reaction is called neutralisation

Acid + metal oxide ----> metal salt + water