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Which of the following statements about water hardness is true?
I. Hard water has a lower pH compared to soft water.
II Hard water contains high amounts of calcium and magnesium bicarbonates.
III Acidic rainwater reduces the hardness of water.
Option: 1
I,II
Option: 2
Only I
Option: 3
Only II
Option: 4
II,III
Answers (1)
The temporary hardness of water is due to the presence of bicarbonates of Ca and Mg.
Most soft waterfalls between the range of 6-7, while most hard water falls between the range of 7-8.
Acidic rainwater increases the hardness of water. Acidic rainwater, which is carbon dioxide-laden, reacts with naturally occurring minerals in the ground, like limestone, to produce chemicals that harden the water.
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