Summary - Unit 5 - Principles and Applications of Science

Unit 5 chemistry revision booklet-
covers ALL chemistry unit 5!

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Unit 5- Inorganic Chemistry- Principles and applications of
science II (examined unit)

A definition of an acid is a substance that releases hydrogen ions, a hydrogen iron is a proton.

Bases is something that can take up H+, usually to make water.

Acid + base = salt + water

An alkali is a base that can dissolve in water.

Alkalis often have a hydroxide ion, OH

Common Acids
Hydrochloric acid (Hcl)

Nitric acid (HNO3)

Sulfuric acid (H2SO4)

Phosphoric acid (H3PO4)

Ethanoic acid (Ch3COOH)



Common vases and alkalis

Sodium hydroxide

Potassium hydroxide

Ammonium hydroxide

Sodium hydrocarbonate (bicarbonate of soda, in baking powder)



PH scale

pH = -log [h+]

‘Strong’ in this context means highly ionised

Weak means not much ionised

Hcl  H+ + cl-




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