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what is the purpose of Buffer in any titration?Ex:In
determination of hardness of water we use ammonia
ammoniachloride buffer in titration with EDTA.Why?
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Answer Posted / suresh
Buffer is a substance it will little resist change in the
pH of the solution.
In Hardness estimation the major substances in water is
Calcium carbonate and magnesium carbonate. The ammonia and
ammonium chloride buffer pH is 10. At the particular pH it
will form the complex with both calcium and magnesium.So
the titre value gives the total hardness of the solution.
If you want to measure calcium alone instead of adding pH
10 buffer add pH 12 buffer (1M NaoH).
| Is This Answer Correct ? | 81 Yes | 8 No |
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