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प्रश्न
Using given sample of temporary and permanent hard water, soft water, ordinary soap, detergent and washing soda how would you remove temporary hardness and permanent hardness from water using a chemical compound?
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उत्तर
To remove temporary hardness and permanent hardness using a chemical compound. Chemical compound used is washing soda which removes both kind of hardness.
Experiment
Temporary and permanent hard water softened by addition of washing soda
- Temporary and permanent hard water are taken separately in beakers and washing soda is added to each sample of water. The above solutions are filtered – to remove the precipitate formed.
- Ordinary soap is rubbed – inside the filtered solution.
Observation
- The filtered sample of temporary and permanent hard water lathers – readily with ordinary soap.
Result
- Temporary hard water and Permanent hard water can be – softened by using washing soda.
APPEARS IN
संबंधित प्रश्न
What causes the temporary and permanent hardness of water?
What do you understand by
Temporary hard water
What do you understand by
Permanent hard water
What are the causes for:
Temporary hardness
Name the substance which makes water temporarily hard
Explain with equation, what is noticed when permanent hard water is treated with
Slaked time
How will you distinguish between temporary hard water and permanent hard water?
Using given sample of temporary and permanent hard water, soft water, ordinary soap, detergent and washing soda how would you distinguish between temporary hard water and permanent hard water?
Both temporary & permanent hardness in water can be removed by addition of washing soda. Give balanced equations for the same.
State what are synthetic detergents. Explain experimentally how you will determine the advantage of synthetic detergents over soap using a sample of hard water.
Name or state the following:
A substance added to remove both temporary and permanent hardness in water.
Match the following.
| Universal solvent | Water pollutant |
| Hard water | Kills germs |
| Boiling | Ozonisation |
| Sterilization | Water |
| Sewage | Stomach ailments |
Give a reason for the following.
Hard water is not good for washing utensils.
What are the causes of temporary hardness and permanent hardness of water?
Why does hard water not form lather with soap?
The pleasant taste of drinking water is due to the presence of a dissolved substance which includes air, CO2, and minerals.
What is soft water?
Which water is hard?
Which water is soft?
