A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by
A
boiling the water
B
adding excess calcium hydroxide
C
adding a calculated amount of calcium hydroxide
D
adding sodium carbonate
E
adding magnesium hydroxide
Verified Correct Answer: D.
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #54)