Question

Equation for the oxidation of glucose by CuO if the compound is oxidized completely to CO2 and H20

Answer 1

Explanation :

Barfoed's test : Monosaccharides and reducing disaccharides can be distinguish by this test. The test solution is prepared by dissolving copper (II) acetate in acetic acid.

The equation for the oxidation of glucose by CuO is:

(1)
`CuO+OH^-\rightarrow CuOOH+e^-`

`CuO+H_2O+OH^-\rightarrow Cu(OH)_4^-+e^-`

(2)
`Cu(III)+e^-+\text{glucose}\rightarrow \text{Gluconolactone}+CuO`

`\text{Gluconolactone}\overset{hydrolysis}\rightarrow \text{Gluconic acid}`

Here, CuO act as a catalyst.

In this reaction, first CuO salt get oxidized to form
`Cu^(3+)` and then get reduced to back
`Cu^(2+)` (CuO).

Hence, the equations are written above.