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Write the Bronsted - Lowry principle for acids and bases. |
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Answer» SOLUTION :The Danish chemist, Johannes Bronsted and the English chemist, Thomas M. Lowry gave a more general definition of acids and bases. DEFINATION "According to Bronsted-Lowry theory, acid is a substance that is capable of donating a hydrogen ion `(H^+)` and bases are substances capable of accepting a hydrogen ion, `(H^+)`." In short, acids are proton donors and bases are proton ACCEPTORS. e.g.-1 : Consider the example of dissolution of `NH_3` in `H_2O` represented by the following equation.  The basic solution is FORMED due to the presence of hydroxyl ions. In this reaction, water molecule acts as proton donor and ammonia molecule acts as proton acceptor and are thus, called Lowry-Bronsted acid-base, respectively. In the REVERSE reaction, `H^+` is transferred from `NH_4^+`to `OH^-`. In this case, `NH_4^+` acts as a Bronsted acid while `OH^-` acted as a Bronsted base. |
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