Question

An iron nail was placed in an unknown solution for couple of hours a reddish brown coating is formed on nail identify the solution and write the chemical equation

Answer 1

Fe(s) + CuSO4(aq) -> Cu(s) + FeSO4(aq)

When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green. This reaction shows that iron is more reactive than copper as it displaces copper from its solution and iron passes into solution as Fe2+ ions and ferrous sulphate solution is formed.

This reaction is a simple displacement reaction.

The iron on the surface of the nail will swap places with some of the copper in the solution. So the iron nail will get a copper coating and the blue copper sulphate solution will start to change to green ferrous sulphate solution.

the iron (2+) wil go in2 d solution and Cu(2+) wil get deposited on d iron nail. so it wil turn reddish-brown and the colour of the solution will also change from blue to green.

Answer 2

Iron(s) + copper sulphate(l)= Iron sulphate + copper