Question

3. Complete and balance the following skeleton reaction and identify the oxidizing and reducing agents. Cro/' (aq) + Cu(s) Cr(OH)3() + Cu(OH)2(s) (basic)

Answer 1

first identify the oxidation ( increase in oxidation number ) and reduction ( decrease in oxidation number ) and then balance them in basic medium as follows

oxidizing agent => CrO42-

reducing agent => Cu

craft crotz + cuGHz Basic) oxidation - cu 2 CuOH)2 + 20 Reduction! - crac té - crot), fabrice charge & oxygous by adding H₂O & On-Pong 0> Cu + 204 ) Cu OH)2 + 20 - R = coon + sé +4H20 - > CV0H), + 50H To balance electrous Ors multiplied with a 4. ou multiplied with 2 37 3c4 + Gol 3 Ch CH, toé 8 = 2n + 4(+8H2O = 2cY0w + 4°F . acrome + 3C4 + 8H20 - 2676m), + 3Cu(OH)2 + 40H-