Reactions with Bases (AQA A-Level Chemistry): Flashcards

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Reactions with Bases
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Three bases that react with metal-aqua ions

OH−\text{OH}^-, NH3\text{NH}_3, CO32−\text{CO}_3^{2-}

Color of Fe2+\text{Fe}^{2+} ppt with NaOHNaOH

Green

Color of Cu2+\text{Cu}^{2+} ppt with NaOHNaOH

Blue

Color of Al3+\text{Al}^{3+} ppt with NaOHNaOH

White

Color of Fe3+\text{Fe}^{3+} ppt with NaOHNaOH

Brown

Behaviour of Al(OH)3Al(OH)_3 in excess OH−\text{OH}^-

Amphoteric - dissolves

Complex: Al(OH)3Al(OH)_3 + excess OH−\text{OH}^-

[Al(OH)4]−[Al(OH)_4]^-

Color of Cu2+\text{Cu}^{2+} with excess NH3\text{NH}_3

Deep blue

Product: [M(H2O)6]2+[M(H_2O)_6]^{2+} + CO32−\text{CO}_3^{2-}

MCO3MCO_3 precipitate

Observation: [M(H2O)6]3+[M(H_2O)_6]^{3+} + CO32−\text{CO}_3^{2-}

Hydroxide ppt + CO2\text{CO}_2 fizzing

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