Advertisements
Advertisements
Question
What do you understand by permanent hardness?
Advertisements
Solution
Permanent hardness refers to the mineral content in the water that is not possible to remove through boiling. The hardness is typically caused by the presence in water of magnesium sulfates and/or calcium sulfate that do not undergo precipitation at increased temperatures.
Therefore, permanent hardness is the sum of magnesium hardness and calcium hardness.
APPEARS IN
RELATED QUESTIONS
What is the major source of fresh water in the city/town/village where you live?
Which property of water enables it to modify the climate?
Define
Henry's law
Select the correct answer of the following statement:
A solution which can pass through a filter paper but not through a semipermeable membrane.
Unscramble the words and fill in the blanks.
- ondencsaonti ______
- vaeionorpat ______
- ecippitatrino ______
Water levels in rivers increase greatly during ______.
State whether the following statement is True or False. If false, give the correct statement.
51% of the earth’s surface is covered with water
From where do the following usually get water? In which form is water present in them?
Animals
Look at the figure.
Write down activities shown in this figure in which water is being used.
Why is there a need for conserving water? Give two reasons.
