An alkali is a substance that produces hydroxide ions, OH - in water.
An alkali can conduct electricity.
pH > 7
It has a bitter taste.
It is caustic .
It is corrosive .
Examples of Acids I n the preparation of fertilizers and explosives HNO 3 Nitric acid In fizzy drinks H 2 CO 3 Carbonic acid In oranges and lemons C 6 H 8 O 7 Citric acid In vinegar CH 3 COOH Acetic acid In car battery H 2 SO 4 Sulphuric acid In gastric juice in the stomach HCl Hydrochloric acid Where can it be found? Chemical formula Names of acids
Acidic or not? Yes Nitric acid HNO 3 (aq) No water H 2 O (s) Yes Ethanoic acid/acetic acid CH 3 COOH(aq) Yes Sulphuric acid H 2 SO 4 (aq) Is it Acidic? Name of compound Chemical name
Sodium hydroxide Hydrochloric acid Potassium hydroxide Sulphuric acid + + + + NaC l (aq) + H 2 O (l) Sodium chloride water K 2 SO 4 (aq) + H 2 O (l) Potassium sulphate water
Uses of Acids Acids Preserving food -acetic acid in vinegar M aking industrial products -nitric acid in fertilisers -sulphuric acid in detergents Rust removal from iron and steel -Sulphuric acid -Hydrochloric acid Car battery -Sulphuric acid
Acids react with bases to give salt and water only.
5. Only aqueous solution of acids have acidic properties.
6. In a strong acid, the acid molecules are completel y ionised.
8. Ethanoic acid is an example of a weak acid.
9. Acids have a sour taste.
Answer Down 2. Sulphuric acid is an example of a strong acid which is found in car battery. 3. Carbonates react with acids to give off a gas that forms a white precipitate with limewater. 4. When dissolved in water, acid molecules can ionise to give hydrogen ions. 7. Hydrogen gas is evolved when acids reac t with metals .