How blue colour is formed in estimation of phosphourous?
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the nature of phrosphrous is such that when you estimate it ,it turns blue
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Answer:Phosphorus in the extract is treated with ammonium molybdate, which results in the formation of heteropoly complexes (phosphomolybdate or phosphomolybdic acid). Phosphomolybdic acid is reduced by ascorbic acid to form a blue complex. The absorbance of developed blue colour should read in Spectrophometer.
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