Question

What happens when a piece of (a) zinc moal is added to copper sulphate solution.
(b) aluminium metal is added to dilute hydrochloric acid? c) silver metal is added to copper
sulphate solution? Also, write the balanced chemical equation if the reaction occurs,​

Answer 1

a) EQUATION :

Zn (s) + CuSO4 (l) --->ZnSO4 (l) + Cu (s)

EXPLANATION :

It's a single displacement reaction where Zn will react with CuSO4, then the blue colour of CuSO4 will displaced by Zn and changed to colourless ZnSO4 .

b) EQUATION :

Al (s) + 2HCl (l) ---> AlCl2 (l) + H2 (g)

EXPLANATION :

It's a single displacement reaction, where Al react with HCl and H2 gases will form as bubble. And AlCl2 Will remain as liquid .

c) EQUATION :

Ag (s) + CuSO4 (l) --> Ag2SO4 (l) + Cu(s)

EXPLANATION :

It's a single displacement reaction, where Ag will react with CuSO4 to form Ag2SO4 and Cu.

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Answer 2

(a)    When zinc metal is added to copper sulphate solution, the colour of CuSO4 solution disappears and colourless zinc sulphate solution is formed. Solid brown copper is deposited as it displaces by Zn.

Zn + CuSO4---------> ZnSO4 + Cu

(b) Aluminium displaces hydrogen from HCl and hydrogen gas is evolved with soluble aluminium chloride.

2Al + 6HCl ---------->  2AlCl3 + 3H2

(c) Silver is a Nobel metal and does not exhibit any reaction with copper sulphate.