1.Acids.
These are solutions formed by dissolving some non-metallic oxides in water whose PH is below 7 and the same turns blue litmus paper red.
2.Bases
These are soluble metal oxides which from alkaline solution with water, the same turns red litmus paper blue.
3.Salts
These are the substances formed when hydrogen ions of acids are partially or wholly replaced by metal ions or an ammonium radical. They also have metallic and non-metallic parts.
4.Indicators
These are substances which have one colour in acidic solutions and another colour in alkaline solutions.
Kavungya answered the question on March 25, 2019 at 10:44
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