Question

1Explain the chemical reaction that takes place between iron and copper sulphate with the help of an

activity.​

Answer 1

Answer:

AIM:

To study the chemical reaction of an iron nail with aqueous copper sulphate

solution; and to study the burning of magnesium ribbon in air.

(a) Chemical reaction of iron nail with copper sulphate solution in water.

MATERIALS REQUIRED

Two test tubes, two iron nails, measuring cylinder (50 mL), laboratory stand

with clamp, test tube stand, thread, a piece of sand paper, single bored

cork, copper sulphate, distilled water, and dil. sulphuric acid,

PROCEDURE

1. Take two iron nails and clean them with a sand paper.

E x p e r i m e n t 1

2. Take 20 mL of distilled water in a

clean test tube and dissolve 1.0 g of

copper sulphate in it. Add 2 or 3

drops of dil. sulphuric acid to it to

check hydrolysis of CuSO4 in water.

Label this test tube as A.

3. Transfer about 10 mL of copper

sulphate solution from tube A to

another clean test tube. Label this

test tube as B.

4. Tie one iron nail with a thread and

immerse it carefully in copper

sulphate solution in test tube B

through a bored cork [as shown in

the Fig 1.1(a)] for about 15 minutes

. Keep the another iron

nail separately for comparison

afterwards.

5. After 15 minutes take out the iron

nail from the copper sulphate

solution.

(a) Iron nail dipped in copper sulphate solution; and (b) Iron nails

and copper sulphate solutions are compared

Test tube

Copper

sulphate

solution

(before

experiment)

Test tube

stand

Reaction mixture

(after experiment)

6. Compare the intensity of blue colour of copper sulphate solution before

and after the experiment in tubes A and B, and also compare the

colour of iron nail dipped in copper sulphate solution with the one

kept separately(b) and (c). Record your observations.

Infer from your observations about the changes in colours of copper sulphate

solution and iron nail. Discuss the reason(s).