8. Acids, Bases and Salts Flashcards
Litmus in base
Blue
Litmus in acid
Red
Phenolphthalein in base
Pink
Phenolphthalein in acid
Colourless
Methyl Orange in base
Yellow
Methyl Orange in neutral
Orange
Methyl Orange in acid
Red
Universal Indicator in acid
Red
Universal Indicator in neutral
Green
Universal Indicator in base
Purple
pH 0-2
strongly acidic [red]
pH 3-6
weakly acidic [orange-yellow]
pH 7
neutral [green]
pH 8-11
weakly alkaline [blue]
pH 12-14
strongly alkaline [purple]
Acids in aq solution are a source of ___ ions
H+
Alkalis in aq solution are a source of ___ ions
OH-
Acid + Alkaline
neutralisation
Acid is a proton ___
Donor
Base is a proton___
Acceptor
Solubility: Nitrates
Soluble
Solubility: Sodium
Soluble
Solubility: Ammonium
Soluble
Solubility: Potassium
Soluble
Solubility: Chlorides
Soluble [except Silver and Lead]
Solubility: Sulfates
Soluble [except Barium, Calcium and Lead]
Solubility: Carbonates
Insoluble [except SAP]
Solubility: Hydroxides
Insoluble [except SAP]
Precipitate
Reaction where an insoluble product is made when mixing two soluble solutions
Neutralisation
Acid and base react to form salt + water
Metal + acid
salt + hydrogen [H2]
Metal oxide + acid
salt + water
Metal hydroxide + acid
salt + water
Metal carbonate + acid
salt+ water + carbon dioxide
Ammonia + acid
Only salt
Crystallisation experiment method
- Heat
- Add excess of solid
- Filter
- Heat again
- Evaporate some water
- Leave to crystallise
- Dry with paper towel
H+(aq) + OH- (aq) ->
H2O (l)