The Effect of Heat on Copper (II) Carbonate (CuCO3), Calcium Hydroxide Ca(OH)2, Sodium Nitrate (NaNO3), Sodium Carbonate (Na2CO3), Hydrated Copper (II) Sulphate (CuSO4.5H2O)

The Effect of Heat on Copper (II) Carbonate (CuCO3), Calcium Hydroxide Ca(OH)2, Sodium Nitrate (NaNO3), Sodium Carbonate (Na2CO3), Hydrated Copper (II) Sulphate (CuSO4.5H2O)

Aim / Objective: 

To observe the effect of heat on five (5) substances

Apparatus/ Materials:

5 test tubes, splints, cobalt chloride paper, samples of copper (II) carbonate (CuCO3), calcium hydroxide Ca(OH)2, sodium nitrate (NaNO3), sodium carbonate (Na2CO3), Hydrated Copper (II) sulphate (CuSO4.5H2O), Bunsen burner, delivery tube, test tube holder, matches,

Method / Procedure:

  1. Place a sample of CuCO3 into a test tube and heat carefully.
  2. Test the gas evolved with lime water by placing a glass stirring rod dipped in lime water into the gas.
  3. Record your observations.
  4. Place a sample of Ca(OH)2 into a test tube and heat carefully. Test the gas evolved with cobalt chloride paper by placing it at the mouth of test-tube.
  5. Note results.
  6. Place a sample of CuSO4 into a test tube and heat carefully. Test the gas evolved with lime water by placing a glass stirring rod dipped in lime water into the gas.
  7. Place a sample of NaNO3 into a test tube and heat carefully. Test the gas evolved with a lighted splint by placing it at the mouth of test-tube.
  8. Note your observations
  9. Place a sample of Na2CO3 into a test tube and heat carefully. Test the gas evolved with lime water by placing a glass stirring rod dipped in lime water into the gas. Note observations.
  10. Tabulate your results.

Suggested Results:

Table showing decomposition of various compounds when heated

Table showing decomposition of various compounds when heated

Discussion:

1. List the substances that decomposed and the substances which did not

>>> Decomposed: CuCO3, Ca(OH)2, NaNO3, CuSO4.5H2O,

Did not decompose: Na2CO3

2. Write the decomposition equation for the reactions

a)    CuCO3(s)                   =               CuO(s) + CO2(g)

b)    Ca(OH)2 (aq)           =                 CaO(s) +  H2O(l)

c)    2NaNO3(aq)            =                 2NaNO2(l)   +  O2(g)

d)    CuSO4.5H2O(s)       =                CuSO4(s)  +   H2O(l)

3. Write equations to show the reactions with Lime Water and Cobalt Chloride paper.

a)    Ca(OH)2 (aq)   +   CO2(g)        =                  CaCO3(s)  +  H2O(l)

b)    COCl2(aq) +  H2O(l)                 =               COCl2.6H2O (s)

4. Write equations for the reaction of heat on Pb(NO3)2  and Mn(NO3)2

a)    2Pb(NO3)2 (aq)        =                 2PbO(s)   + O2(g)   + 2NO2(g)

b)    2Mn(NO3)2 (aq)      =                2MnO(s)   + O2(g)   + 2NO2(g)