Hard Water
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Balanced equation of calcium oxide with water
What is the formula for Hard Water?
When zeolite is treated with hard water, the sodium ions are exchanged with:
OH− ions
SO2−4ions
Ca2+ ions
H+ ions
Name the salts that cause hardness of water.
- Rivers
- Oceans
- Wells
- Lakes
Water which forms scum with soap is called
soft water
hard water
distilled water
heavy water
What happens when hard water is treated with washing soda?
- It does not lather readily with soap.
- It does not contain minerals.
- It contains minerals.
- It lathers readily with soap.
The deposit of calcium carbonate in the boiler is a bad conductor of heat.These deposits of calcium carbonate is stone like and is called
- True
- False
The hardness of water can be detected using ______.
electrolysis
lathering soap
litmus paper
thermometer
Name the compound (NH4)2SO4
Statement 1: Hard water contains dissolved salts of calcium and magnesium.
Statement 2: Hard water lathers easily with soap.
- Statement 1 is correct but statement 2 is incorrect
- Statement 2 is correct but statement 1 is incorrect
- Both statement 1 and statement 2 are incorrect
- Both statement 1 and statement 2 are correct
An example of soap is
- C17H35COONa
- CH3COONa
- CH3ONa
- C17H35COOC2H5
List the disadvantage of hard water.
- True
- False
- calcium chloride
- calcium carbonate
- calcium sulphate
- calcium bicarbonate
There are two water samples one in test-tube A and another in test-tube B. It was observed that water in both test-tubes A and B does not give lather with soap. However, after boiling the water in both the test-tubes A and B, the water in test-tube B does give lather with soap. Which among the following statements is correct?
Water in both the test-tubes is permanent hard water.
Water in test-tube A is permanent hard water while in test-tube B is temporary hard water.
Water in test-tube A is temporary hard water while in test-tube B is permanent hard water.
Water in both the test-tubes is temporary hard water.
- FeSiO3
- CaSiO3
- CaCO3
- Both (1) & (2)