Question

4g of copper was dissolved in conc. hno3. the copper nitrate thus obtained gave 5g of its oxide on strong heating the equivalent weight of copper is

Answer 1

Hello Dear.

Given in the question:-  4 g of copper gave 5 g of copper oxide when dissolved.

Therefore for finding the equivalent weight, Mass of oxygen in oxides are

Now weight of Oxygen in CuO :- 5 g - 4 g = 1 

∴We know, weight of Cu which combine 1 g of O₂ = 4 

Now weight of Cu which react 8 g of Oxygen = 4 x 8  
=32

Hence equivalent weight of Cu is 32.



Hope it Helps.

Answer 2

Explanation:

5 gm CuO,4gm Cu and 1 gm O be present.

Empirical formula =CuO of oxide

In this oxide, oxidation no. of Cu=+2

Equivalent weight=Molecular weightOxidation no.=63.52≈31.75

But equivalent weight should be an integral no.=32.

=9.65A