what are the property of alkalies?
Answers
Answer:
Common properties of alkalis and bases
Alkalis are all Arrhenius bases, ones which form hydroxide ions (OH−) when dissolved in water. Common properties of alkaline aqueous solutions include: Moderately concentrated solutions (over 10−3 M) have a pH of 7.1 or greater.
Answer: What are the Properties of Alkalis?
1. All alkalis have a pH greater than 7 and make hydroxide ions in water.
2. All alkalis will make litmus paper turn from red to blue and universal indicator will turn blue or purple.
3. All alkalis react with acids to form a salt and water, see neutralization.
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. Sodium
hydroxide is also used to neutralize acids to make salts.
2) Calcium oxide or calcium carbonate is used to
remove acidic gases from a power station chimney to reduce
acid rain. Calcium carbonate has many other uses.
3) Calcium hydroxide (called 'slaked lime', or just 'lime'),
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 gas.
4) Ammonia is used in the Haber process to make fertilizer.
5) Hydrochloric acid is produced in the stomach to
kill harmful bacteria that may be present on food.
Indigestion can be caused by too much (excess)
hydrochloric acid in the stomach. Indigestion tablets
contain a base such as magnesium oxide or
calcium carbonate which can neutralise the excess acid.