Advertisements
Advertisements
Question
Differentiate between the following:
Deliquescent salt and hygroscopic salt
Advertisements
Solution
| Deliquescent salt | Hygroscopic salt: |
| Water soluble salts which on exposure to the atmosphere absorb moisture from the atmosphere dissolve in the absorbed moisture and change into liquid state are called Deliquescent salt. e.g. washing soda (Na2CO3.10H2O) | Absorb water or moisture from the atmosphere when exposed but do not change their state like delinquent salts. e.g. Cone. H2SO4, quick lime CaO. |
APPEARS IN
RELATED QUESTIONS
Give two examples of Crystalline anhydrous substances.
What do you observe when Blue vitriol is heated?
The substance that can remove hydrogen and oxygen atoms in the ratio of 2:1(in the form of water) from the compound.
What are drying or desiccating agents? Give examples.
Complete the following table:
|
Common Name |
Chemical Name |
Formula |
Acid, base or salt |
Efflorescent, hygroscopic or deliquescent substance |
|
Solid caustic potash |
|
|
|
|
|
Quick lime |
|
|
|
|
|
Oil of vitriol |
|
|
|
|
|
Washing soda |
|
|
|
|
|
Solid caustic soda |
|
|
|
|
|
Blue vitriol |
|
|
|
|
Explain the following observation:
In the expression anhydrous copper sulphate, what is meant by “anhydrous”?
Differentiate between hydrated and anhydrous crystals with examples. State three defined changes that occur when hydrated copper sulphate is heated.
Give a reason for the following:
Heating a hydrated copper sulphate crystal is deemed a chemical change.
A hot saturated solution of copper sulphate forms crystals as it cools. Why?
'A' is a blue coloured crystalline salt. On heating, it loses blue colour and to give 'B'. When water is added, 'B' gives back to 'A'. Identify A and B, write the equation.
