Advertisements
Advertisements
Question
Select the correct answer from the choice given in the options.
A substance which causes hardness in water _____.
Options
NH4Cl
CaCl2
NaCl
Solution
A substance which causes hardness in water CaCl2.
APPEARS IN
RELATED QUESTIONS
What do you understand by
Temporary hard water
What do you understand by
Permanent hard water
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.
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?
The pleasant taste of drinking water is due to the presence of a dissolved substance which includes air, CO2, and minerals.
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?
1000 g aqueous solution of CaCO3 contains 10 g of calcium carbonate. Hardness of the solution is ______.