Acids and Alkalis
What are the Properties of Alkalis?
All alkalis have a pH greater than 7 and make hydroxide ions in water.
make litmus paper
turn from red
and universal indicator will turn blue or purple.
All alkalis react with acids to form a salt and water, see neutralisation.
What are the Uses of Alkalis?
1) Sodium hydroxide is used
in the manufacture
of paper, soap and ceramics.
Ceramics include plates, cups, bricks and tiles.
Sodium hydroxide is used as an alkali cleaner and to treat aluminium
before anodising. It is also used to neutralise acids to make salts.
oxide or calcium
carbonate is used to remove
from a power station chimney to reduce acid rain.
Calcium carbonate has many other uses.
(called 'slaked lime', or just
is added to soils or lakes to make them less acidic (see acid rain).
Calcium hydroxide solution (lime water)
is used in the test for carbon dioxide).
4) Ammonia is used in the Haber process to make fertiliser.
5) Indigestion may be caused by
too much hydrochloric acid in the stomach.
Indigestion tablets contain a base such as
magnesium oxide or calcium carbonate to neutralise the acid.
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