AP EAMCET · Chemistry · Hydrogen
The following methods can not be used to remove permanent hardness of water
- A Treatment with washing soda
- B Ion-exchange method
- C Treating with Calgon
- D Adding calculated amount of lime
Answer & Solution
Correct Answer
(D) Adding calculated amount of lime
Step-by-step Solution
Detailed explanation
(d) Lime is added to hard water to remove temporary hardness. (Clark's method) \(\mathrm{Ca}\left(\mathrm{HCO}_3\right)_2+\mathrm{Ca}(\mathrm{OH})_2 \Rightarrow 2 \mathrm{Ca} \mathrm{CO}_3 \downarrow+2 \mathrm{H}_2 \mathrm{O}\)
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