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Slide 1

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Acids and Alkalis, Salts and
GCSE Revision…read more

Slide 2

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The pH scale is a measure of how acidic or alkaline a substance is.
This can be measured using coloured dyes called indicators, the universal indicator is
usually used.
pH's 1 ­ 6 are acidic (with one being strongly acidic)
pH 7 is neutral (It is neither acidic or alkaline)
pH's 8 ­ 14 are alkaline (with 14 being strongly alkaline)
pH Scale:

Slide 3

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Acids and Bases
An acid is a substance <pH 7
A base is a substance >pH 7
When the two react together, it is called
neutralisation.…read more

Slide 4

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Acid + Base Salt + Water
H+ + OH- H20
When an acid neutralises a base, the products
are neutral (ph 7)…read more

Slide 5

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Acids reacting with Metals
Acid + Metal Salt + Hydrogen
Hydrochloric Acid produces CHLORIDE salts:
2HCl + Mg MgCl2 + H2 (Magnesium Chloride)
Sulphuric Acid produces SULFATE salts:
H2SO4 + Mg MgSO4 + H2 (Magnesium Sulphate)
Nitric Acid produces NITRATE salts…read more

Slide 6

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Acids + Metal Oxides / Hydroxides
All metal oxides and hydroxides react as a base
with acid to form salt and water.
Acid + Metal Oxide Salt + Water
Acid + Metal Hydroxide Salt + Water…read more

Slide 7

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