Question

state whether a displacement reaction will occur if the following are mixed. give reasons. give the reaction.
a.copper sulphate and zinc
b.copper sulphate and iron
c.zinc sulphate and copper
d.zinc sulphate and iron
e.iron sulphate and zinc
f.iron sulphate and copper

Answer 1

a. Yes it will occur as zinc is more reactive than copper.

CuSO₄ + Zn = ZnSO₄ + Cu

b. Yes it will occur as iron is more reactive than copper.

CuSO₄ + Fe = FeSO₄ + Cu

c. No reaction since copper is less reactive than zinc.

d. No reaction since iron is less reactive than zinc.

e. Yes it will occur since zinc is more reactive than iron.

FeSo₄ + Zn = ZnSO₄ + Fe

f. No reaction since copper is less reactive than iron.

Answer 2

Explanation:

(a) Copper sulphate and Zinc: A displacement reaction will occur between copper sulphate and zinc because zinc is placed above copper in the reactivity series. Thus, it will replace copper.

Zn + CuSO4 --> ZnSO4 + Cu

(b) Copper sulphate and Iron: A displacement reaction will occur because iron is placed above copper. Thus, it will replace copper.

Fe + CuSO4 —> FeSO4 + Cu

(c) Zinc sulphate and copper: A displacement reaction will not occur here because copper is placed below zinc. Thus, it will not replace zinc.

(d) Zinc sulphate and iron: A displacement reaction will not occur here because iron is placed below zinc. Thus, it will not replace zinc.

(e) Iron sulphate and zinc: A displacement reaction will occur because zinc is placed above iron. Thus, it will replace iron.

Zn + FeSO4 —> ZnSO4 + Fe

(f) Iron sulphate and copper: A displacement reaction will not occur here because copper is placed below iron. Thus, it will not replace iron from iron sulphate.