Question

A metal X forms a salt XSO4. The salt XSO4 forms a clear solution in water which reacts with sodium

hydroxide solution to form a blue precipitate Y. Metal X is used in making electric wires and alloys like

brass.

a) What do you think metal X could be?

b) Write the name, formula and colour of salt XSO4.

c) What is the blue precipitate Y?​

Answer 1

a) Metal X is Copper (Cu).

b) The name, formula and colour of salt$\tt \red{ XSO_{4} }$ is Copper sulphate, $\tt \red{CuSO_{4} }$and blue colour respectively.

c) The blue precipitate Y is Copper hydroxide, $\tt \red{ [Cu(OH)_2] }$

d) $\tt \red{ CuSO_{4}+2NaOH→Cu(OH)_{2}+Na_{2}SO_{4} }$