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Which of the following bicarbonate is insoluble in water? Mg(HCO3)2 NaHCO3 KHCO3 Ca(HCO3)2

Which of the following bicarbonate is insoluble in water?
 
  • Mg(HCO3)2
  • NaHCO3
  • KHCO3
  • Ca(HCO3)2

Grade:11

2 Answers

Arun
25750 Points
5 years ago
Dear student
 
KHCO3 is insoluble in water.
hence option C is correct.
 
Regards
Arun(askIITians forum expert)
Rajdeep
231 Points
5 years ago
HELLO THERE!
 
My answer is different: and I’m quite confident.
 
If you consider MgHCO3 and CaHCO3, they are no doubt soluble in water more than KHCO3 and NaHCO3.
 
Now, the competition is between KHCO3 and NaHCO3.
 
If you go by data, then 22.5-62.5 grams of KHCO3 is soluble in 100g of water at 0-60oC.
However, only 7-16 grams of NaHCO3 is soluble in 100g of water at 0-60oC.
 
So, NaHCO3 is insoluble in water.
 
One more proof:
If you know about Solvay process of preparing sodium carbonate, it requires formation of sodium bicarbonate using some reagents and then heating of sodium bicarbonate to form sodium carbonate. This is possible because NaHCO3 is not soluble in water and hence can be easily separated out.
However, you cannot prepare Potassium bicarbonate using solvay process, because KHCO3 is soluble in water and cannot be separated out.
 
HOPE MY ANSWER IS SATISFACTORY...
Thanks!

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