A. Sodium bicarbonate
B. Calcium sulfate
C. Calcium bicarbonate
D. None of these
Submitted by: Mirza Musawer Jamil
Permanent hardness of water is due to the presence of Calcium sulfate. Permanent hardness is hardness (mineral content) that cannot be removed by boiling. When this is the case, it is usually caused by the presence of calcium sulfate and/or magnesium sulfates in the water, which do not precipitate out as the temperature increases.
Correct Answer: Calcium sulfate ✔
Last Updated: December 30, 2021