In 1923, the Danish chemist Bronsted and the English chemist Lowry independently presented their theories of acids and bases on the basis of proton-transfer. According to this concept:
An acid is a substance (molecule or ion) that can donate a proton (H+) to another substance.
A base is a substance that can accept a proton (H+)from another substance.
For example, HCl acts as an acid while NH3 acts as a base.
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