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Chemistry - Acids & Bases

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Wong Jocelyn

on 14 April 2010

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Transcript of Chemistry - Acids & Bases

Acids & Bases! Acids Subtance that produce hydrogen ion (H+) when dissolved in water.

Conduct electricity after dissolved in water.

Turn blue limtus paper red. Formulae Acid + Metal - Salt + Hydrogen
Acid + Base - Salt + Water
Acid + Carbonate - Salt + Water + Carbon Dioxide
Alkali + Ammonium Salt - Salt + Water + Ammonia
Alkali + Salt (Metal A) - Metal Hydroxide + Salt (Metal B)
Bromide: Br -
Chloride: Cℓ -
Hydroxide: OH -
Nitrate: NO₃ -
Oxide: O² -
Sulfate: SO₄² -
Carbonate: CO₃² -
Symbols
Bases Contains O² - (oxide) or OH- (hydroxide) ions.
Oxide, Hydroxide, Alkali Alkali Produce hydroxide ion when dissolved in water.
Turn red limtus paper blue.
Eg. Sodium hydroxide, Calcium hydroxide, Ammonia. Strength of Acids Strong Acids
completely ionised in water.
Weak Acids
Partially ionised in water.
How to test:
Using equal length of magnesium ribbon, measure the time taken for it to dissolve in a fixed vol. of acid of same concentration. Oxides Acidic oxides
Basic oxides

Amphoteric oxides (metallic oxides that reacts with both acids and alkaline to form salt and water.)

Neutral oxide (Insoluble in water)
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