Advertisements
Advertisements
प्रश्न
Explain with equation, what is noticed when permanent hard water is treated with
Slaked time
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?
What do you understand by
Permanent hard water
What are the causes for
Permanent hardness
Name the substance which makes water temporarily hard
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?
Select the correct answer from the choice given in the options.
A substance which causes hardness in water _____.
Soap lathers well in hard 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?
Take samples of water from different sources (like a tube well, a lake, a pond, or a river) and pour equal quantities of each sample of water into different test tubes. Measure the height of water in each test tube with a scale. Add one or two drops of liquid soap to each test tube. Shake each test tube five times and observe the height of the lather in each sample. Record your observations in the table. Which water is soft? Which water is hard? Can you say why?
