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Home / Acid base and salt / Uses of bases or alkalies
USES OF BASES OR ALKALIES
Acid base and salt of Class 8 USES OF BASES/ALKALIES Caustic soda and Caustic potash: They are extensively used in the manufacture of soaps from vegetable oils. They are used in paper industry for preparing paper pulp. They are used for making artificial fibres such as rayon, nylon, etc. They are used in the manufacture of medicines.
Calcium oxide and calcium hydroxide They are used for neutralisation of acidity of the acidic soils. Calcium hydroxide suspension is used for white washing. Calcium hydroxide is used for making mortar, which is used in the construction of buildings. Calcium hydroxide is used for removing hair from the animal skins. Calcium hydroxide is used for preparing bleaching powder.
Magnesium hydroxide and Aluminium hydroxide They are used as antacids for relieving acidity in the stomach. Comparison between properties of acids and bases : Acids
Bases
Sour in taste.
Bitterness in taste.
Change colours of indicators e.g. Litmus turns from blue to red, phenolphthalein remains colourless.
Change colours of indicators e.g., litmus turns from red to blue, phenolphthalein turns from colourless to pink.
Acidic properties disappear when reacts with bases.
Basic properties disappear when reacts with acids
Decompose carbonate salts.
No decomposition of carbonate salts by bases.
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Introduction
Classification of acid
what is base
Uses of bases or alkalies
Indicators
Salts
Uses of salts in daily life
Solved questions
Exercise 1
Exercise 2
Exercise 3