Advertisements
Advertisements
Question
What are the causes for
Permanent hardness
Advertisements
Solution
The presence of sulphates and chlorides of magnesium and calcium makes water permanently hard.
APPEARS IN
RELATED QUESTIONS
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 permanently 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?
Soap lathers well in hard water.
Why does hard water not form lather with soap?
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?
