Advertisements
Advertisements
प्रश्न
Explain with equation, what is noticed when permanent hard water is treated with
Slaked time
Advertisements
उत्तर
Slaked lime
\[\ce{Ca(HCO3)2 + Ca(OH)2 ->[Boil] 2CaCO3 + 2H2O}\]
\[\ce{Mg(HCO3)2+ Ca(OH)2 ->[Boil] MgCO3 + CaCO3 + 2H2O}\]
Lime is first thoroughly mixed with water in a tank and then fed into another tank containing hard water. Revolving paddles thoroughly mix the two solutions. Most of the calcium carbonate settles down. If there is any solid left over, it is removed by a filter. This is known as Clarke's process.
APPEARS IN
संबंधित प्रश्न
What causes the temporary and permanent hardness of water?
Discuss the principle and method of softening of hard water by synthetic ion-exchange resins.
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 remove temporary hardness from water without using a chemical compound?
Soap lathers well in hard 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.
Why does hard water not form lather with soap?
What is soft water?
Which water is soft?
