Which of the following bicarbonate is insoluble in water?

• Mg(HCO3)2
• NaHCO3
• KHCO3
• Ca(HCO3)2

Dear student

 

KHCO3 is insoluble in water.

hence option C is correct.

 

Regards

Arun(askIITians forum expert)

HELLO THERE!

 

 

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 0-60^oC.

However, only 7-16 grams of NaHCO₃ is soluble in 100g of water at 0-60^oC.

 

So, NaHCO₃ is insoluble in water.

 

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!