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15 cards from this deck
Insoluble base (e.g. metal oxide or carbonate)
To avoid inhaling acid fumes
Add base in excess until no more reacts
Filter paper and funnel
Evaporate water, cool to crystallise, filter & dry
A soluble base
Both alkali & salt are soluble; could contaminate salt
Pipette
Indicator changes colour
When the acid has been neutralised
To make pure salt (avoid contamination with indicator)
Colour change is too gradual
Pink in alkali, colourless when neutral
Red in acid, yellow in neutral/alkali
To avoid excess reactants contaminating the salt
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