Acidic, Basic and Neutral materials of Class 7


Substances with bitter taste and soapy touch are regarded as bases. Since many bases like sodium hydroxide and potassium hydroxide have corrosive action on the skin and can even harm the body, so according to the modern definition – a base may be defined as a substance capable of releasing one or more OH- ions in aqueous solution.


Some bases like sodium hydroxide and potassium hydroxide are water soluble. These are known as alkalies. Therefore water soluble bases are known as alkalieseg. KOH, NaOH. A list of a few typical bases along with their chemical formulae and uses is given below-

Name Commercial Name Chemical Formula Uses
Sodium hydroxide Caustic Soda NaOH In manufacture of soap, paper, pulp, rayon, refining of petroleum etc.
Potassium hydroxide Caustic Sba KHO In alkaline storage batteries, manufacture of soap, absorbing CO2 gas etc.
Calcium hydroxide Slaked lime Ca(OH)2 In manufacture of bleaching powder softening of hard water etc.
Magnesium hydroxide Milk of Magnesia Mg(OH)2 As an antacid to remove acidity from stomach
Aluminum hydroxide Al(OH)3 As foaming agent in fire extinguishers.
Ammonium hydroxide NH4OH In removing greases stains from cloths and in cleaning window panes.
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