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Learning Objective
1. Why are solutions acidic
or alkaline?
2. How is acidity measured?…read more

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What are acids & bases?
Substance dissolved in water = aqueous
solution.
May be acidic, alkaline or neutral.
Bases = chemicals which can neutralise acids
Alkalis = bases which dissolve in water
Pure water is neutral…read more

Slide 4

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What is a base?
What is an alkali?…read more

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Acids
E.g. citric acid, sulfuric acid, ethanoic acid
(vinegar)
Taste sour (but many are too dangerous to
taste at all)
Hydrochloric acid is made when hydrogen
chloride (HCl) gas dissolves in water:
HCl (g) H+ (aq) + Cl- (aq)
water…read more

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Acids
All acids form H+ ions when added to water
H+ ions make a solution acidic
Hydrogen chloride also forms chloride ions (Cl-
)
`(aq)' = shows ions are dissolved in water…read more

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