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Question
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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Solution
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.
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RELATED QUESTIONS
What do you understand by
Permanent hard water
Name the substance which makes water permanently hard.
Using given sample of temporary and permanent hard water, soft water, ordinary soap, detergent and washing soda how would you remove temporary hardness from water without using a chemical compound?
Both temporary & permanent hardness in water can be removed by addition of washing soda. Give balanced equations for the same.
Select the correct answer from the choice given in the options.
A substance which causes hardness in water _____.
Soap lathers well in hard water.
Match the following.
| Universal solvent | Water pollutant |
| Hard water | Kills germs |
| Boiling | Ozonisation |
| Sterilization | Water |
| Sewage | Stomach ailments |
What are the causes of temporary hardness and permanent hardness of water?
Why does hard water not form lather with soap?
Which water is hard?
