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  • On boiling hard water calcium bicarbonate precipitates out as calcium carbonate but magnesium bicarbonate precipitate out as magnesium hydroxide because  

On boiling hard water calcium bicarbonate precipitates out as calcium carbonate but magnesium bicarbonate precipitate out as magnesium hydroxide because

 

Option: 1

The solubility of \mathrm{CaCO}_3  is more than \mathrm{MgCO}_3 
 


Option: 2

The solubility of  \mathrm{MgCO}_3 is more than that of \mathrm{CaCO}_3
 


Option: 3

The solubility of \mathrm{Mg}(\mathrm{OH})_2  is less than \mathrm{Ca}(\mathrm{OH})_2 


Option: 4

Both b and c


Answers (1)

best_answer

\mathrm{Ca}\left(\mathrm{HCO}_3\right)_2 \stackrel{\text { Heat to boil }}{\rightleftharpoons} \mathrm{CaCO}_3 \downarrow+\mathrm{CO}_2 \uparrow+\mathrm{H}_2 \mathrm{O}

\mathrm{Mg}\left(\mathrm{HCO}_3\right)_2 \stackrel{\text { Heat to boil }}{\rightleftharpoons} \mathrm{Mg}(\mathrm{OH})_2 \downarrow+2 \mathrm{CO}_2

The solubility of  \mathrm{MgCO}_3 is more than \mathrm{CaCO}_3  and solubility of  \mathrm{Mg}(\mathrm{OH})_2  is less than \mathrm{Ca}(\mathrm{OH})_2  as such \mathrm{Mg}(\mathrm{OH})_2 Equilibrium in this reaction is displaced forward by the removal of carbon dioxide and formation of ppt.

 

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