When water is added to copper sulphate it turns B_____.
When it is heated it turns W______ again.
This proves that P_____ change is taking place.
Answers
Answer:
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.
THEORY
Iron displaces copper ions from an aqueous solution of copper sulphate. It is
a single displacement reaction of one metal by another metal. Iron is placed
above copper in the activity series. Elements placed above in this series are
more reactive than those placed below them. Thus iron is more reactive than
copper. In this reaction, metallic iron is converted into ferrous ion (Fe2+) and
cupric ion (Cu2 +) is converted into metallic copper.
Fe (s) + Cu2 + (aq) → Fe2+ (aq) + Cu (s).
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
UNIT I
Materials
17-04-2018
Laboratory Manual Science
14
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
[Fig. 1.1(a)]. Keep the another iron
nail separately for comparison
afterwards.
5. After 15 minutes take out the iron
nail from the copper sulphate
solution.
Fig. 1.1 : (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 experimnet)
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 [Fig. 1.1(b) and (c)]. Record your observations.
(a)
(b)
Test tube
Thread
Copper sulphate
solution
Iron nail
Stand
Iron nail taken out
from copper
sulphate solution
Iron nail
(c)
17-04-2
Explanation:
Answer:
When Copper sulfate is heated strongly, it changes into white coloured anhydrous copper sulphate. Later, when water is added again to it then again the colour of copper sulphate is changed to blue. It is a reversible chemical change.Students should observe the colour change from pale blue to white and the change back to blue when water is added. ... The more observant should notice that the addition of water to anhydrous copper(II) sulfate is exothermic, as the tube becomes noticeably hot if the water is added very slowly.
Explanation:
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