Hydrogen And Its Compounds Question 64
Question: which of the following process permanent hardness of water can be removed, by adding
[AFMC 2005]
Options:
A) Sodalime
B) Sodiumbicarbonate
C) Washing soda
D) Sodium chloride
Show Answer
Answer:
Correct Answer: C
Solution:
Washing soda removes both the temporary and permanent hardness by converting soluble calcium and magnesium compounds into insoluble carbonates. $ CaCl_2+Na_2CO_3\to CaCO_3+2NaCl $
$ CaSO_4+Na_2CO_3\to CaCO_3+Na_2SO_4 $
$ Ca{{(HCO_3)}_2}+Na_2CO_3\to CaCO_3+2NaHCO_3. $
BETA
