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| NH4 is the Bronsted-Lowry Acid and H2O is the Bronsted-Lowry Base. | |
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| And NH3 is called the conjugate base and H3O is the conjugate acid. | |
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| What about the Lewis definition? | |
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| Aha. Here it is. It says here that it is proposed by Gilbert Newton Lewis in 1923. It is the broadest definition and includes other definitions. | |
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| The Lewis acid is a substance that accepts an electron pair. The Lewis base is a substance that donates an electron pair. | |
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