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Explain Bronsted-Lowry theory of acids and bases.

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Acid : According to Bronsted-Lowry theory acid is a substance that donates a proton (H+) to another substance.

Base : According to this theory base is a substance that accepts a proton (H+) from another substance. 

For example,

Since HCl donates a proton it is an acid while NH3 accepts a proton it is a base.

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