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What is the qualitative Benedicts equation when reacting with glucose solution in symbols?
Ulex says: There are two steps.
Step 1: copper(II) ions are reduced to copper(I) ions whilst glucose is oxidised to gluconic acid:
| CHO + 2Cu2+ | + H2O -> | CO2H + 2Cu+ | + 2H+ |
| I | I | ||
| CHOH | CHOH | ||
| I | I | ||
| etc | etc |
Step 2: copper(I) ions react with thiocyanate ions to give a white precipitate of copper(I) thiocyanate:
Cu+ + CNS- -> CuCNS
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updated: 12 May 2006
