Question

when water id added to compound a of calcium solution of compound b is formed.when co2 is passed into the solution it turns milky due to the formation of compound c.if excess of co2 is passed into it solution milkiness disppears due to formation of compound d . identify a,b,c,d.explain why milkiness disappears.

Answer 1

Dear Student,

$$\begin{gathered} \mathrm{Compound}\mathrm{A}\mathrm{is}\mathrm{Calcium}\mathrm{Oxide}\mathrm{i}.\mathrm{e}.\mathrm{CaO}.\mathrm{When}\mathrm{water}\mathrm{is}\mathrm{added}\mathrm{to}\mathrm{it},\mathrm{calcium}\mathrm{hydroxide}\mathrm{i}.\mathrm{e}.\mathrm{Ca}\left(\mathrm{OH}{)}_2\right(\mathrm{B})\mathrm{is}\mathrm{formed}. \\ \mathrm{When}{\mathrm{CO}}_2\mathrm{is}\mathrm{passed}\mathrm{into}\mathrm{it},\mathrm{it}\mathrm{turns}\mathrm{milky}\mathrm{due}\mathrm{to}\mathrm{the}\mathrm{formation}\mathrm{of}\mathrm{Calcium}\mathrm{carbonate}\mathrm{i}.\mathrm{e}.{\mathrm{CaCO}}_3(\mathrm{C}).\mathrm{When}\mathrm{excess}\mathrm{of}{\mathrm{CO}}_2\mathrm{is}\mathrm{passed}\mathrm{into}\mathrm{it}\mathrm{milkiness}\mathrm{disappears}\mathrm{due}\mathrm{to}\mathrm{the}\mathrm{formation}\mathrm{of}\mathrm{Calcium}\mathrm{bicarbobate}\mathrm{Ca}({\mathrm{HCO}}_3{)}_2\left(\mathrm{D}\right) \\ 2\mathrm{CaO}\left(\mathrm{s}\right)\hspace{0.17em}+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to \mathrm{Ca}\left(\mathrm{OH}{)}_2\right(\mathrm{l}) \\ (\mathrm{A})(\mathrm{B}\left) \\ \mathrm{Ca}\right(\mathrm{OH}{)}_2\left(\mathrm{l}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)\hspace{0.17em}\to {\mathrm{CaCO}}_3\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \\ \left(\mathrm{B}\right)\left(\mathrm{C}\right) \\ {\mathrm{CaCO}}_3\left(\mathrm{s}\right)+\hspace{0.17em}{\mathrm{CO}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to \mathrm{Ca}\left({\mathrm{HCO}}_3{)}_2\right(\mathrm{aq}) \\ (\mathrm{C})(\mathrm{D}) \end{gathered}$$