ACIDS BASES AND PH

Acids Bases and pHYear 8 ScienceMr KosThis template can be used as a starter file for presenting training materials in a group setting.

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1Acids and Bases at Home:

Animal StingsSome animal stings contain acids (eg ant or bee). These can be neutralised by a base like most soaps. Other stings can be basic (eg wasp or jellyfish) and they can be treated using an acid like vinegar.

Acids and Bases at Home:

GardeningSome plants prefer acid soil and some basic soilLime increases pH (basic)Ammonium Sulphate decrease pH (acidic)

SwimmingSwimming pool needs to be between pH 7.2-7.8

Reactions of Acids and Bases:With Carbonates

Carbonate + Acid Salt + Water + Carbon Dioxide

EgSodium Bicarbonate + Hydrochloric acid Sodium Chloride + Water + Carbon Dioxide

Reactions of Acids and Bases:With Hydroxides

Hydroxide + Acid Salt + water

Eg

Sodium Hydroxide + Hydrochloric acid Sodium chloride + Water

Reactions of Acids and Bases:With Metals

Metal + Acid A Salt + Hydrogen

Eg

Zinc + Hydrochloric Acid Zinc Chloride + Hydrogen

Testing Gold with acids:

Scratch the object with a file and apply a drop of Nitric Acid. If the object turns a bright green it is gold plated or gold filled on base metal. If the object turns a pinkish cream colour it is plated or gold filled on silver. 10 karat gold will turn dark brown. 12 karat gold will turn light brown. 14 karat or higher will have little or no reaction.