Acids can be classified as inorganic acids(eg.HCL) versus organic acids(carbolic acid).Acids can be classified as weak(eg.acetic acid) versus strong acids(eg.nitric acid).Alkalis can be classified as...
The main type of chemical indicator is is universal indicator. It uses pH levels to measure the acidity in liquids. A drinkable level is around pH 7. Overall the levels range from 1-14.