CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

What would you observe when crystals of copper (II) sulphate and iron (II) sulphate are separately heated in two test tubes ?

Open in App
Solution

Action of heat on copper (II) sulphate crystals

When copper (II) sulphate crystals are heated in a hard glass test tube, the following observations are made.
selina-icse-solutions-for-class-9-chemistry-water-6b-6-1

  1. The crystals are converted into a powdery substance.
  2. The crystals lose their blue colouration on further heating.
  3. Steaming vapour is produced inside the tube which condenses near the mouth of the tube to form a colourless liquid.
  4. On further heating, steams escapes from the mouth of the tube and water gets collected in a beaker placed under the mouth of the tube.
  5. On further heating, the residue changes to a white powder and steam stops coming out.

CuSO4.5H2O heat CuSO4 + 5H2O

The action of heat on iron (II) sulphate

When iron (II) sulphate is heated in a test tube, the following observations are made.

  1. The crystals crumble to white powder and a large amount of steam and gas are given out.
  2. On strong heating, a brown residue of ferric oxide (Fe2O3) is produced and a mixture of SO2 and SO3 is given off.

FeSO4.7H2O heat FeSO4 + 7H2O

2FeSO4 ferricoxide−−−−−−−−(Brownresidue) Fe2O3 + SO2 + SO3


flag
Suggest Corrections
thumbs-up
2
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Crystallisation
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon