Advertisements
Advertisements
Question
Explain how, impure copper sulphate can be purified by crystallisation.
Advertisements
Solution
Impure copper sulphate can be purified by crystallization. Crystallization is a chemical solid–liquid separation technique in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs.
Impure copper sulphate can be dissolved in minimum amount of water to prepare copper sulphate solution. It is then filtered to remove insoluble impurities. Now, copper sulphate solution is heated gently on a water bath to evaporate water and obtain a saturated solution. Heating should be stopped when all the water evaporates. The saturated solution of copper sulphate is then allowed to cool slowly. Crystals of pure copper sulphate are formed leaving behind impurities.
APPEARS IN
RELATED QUESTIONS
The smallest unit of matter that exists freely in nature is called ...........
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Differentiate between an atom and a molecule.
Name the terms for the particles of matter which may or may not have independent existence.
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
On the basis of composition of matter, milk is considered to be :
Define solvent.
Name the different types of solutions. Give one example of each.
21.5 g of sodium chloride dissolves in 60 g of water at 25°C. Calculate the solubility of sodium chloride in water at that temperature.
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
How will you separate camphor, common salt and iron nails from their mixture ?
Explain how, nitrogen , oxygen and argon gases are separated from air.
The best way to recover sugar from an aqueous sugar solution is :
Explain the meaning of the term ‘matter’.
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
Define the term matter.
Define the term matter.
