Analytical Chemistry Question 15
Question: When $ CO_2 $ is passed into lime water it turns milky. When excess of $ CO_2 $ is passed, milkyness disappears because
Options:
A) Reaction is reversed
B) Water soluble $ Ca{{(HCO_3)}_2} $ is formed
C) Vaporisable calcium derivative is formed
D) None of these
Show Answer
Answer:
Correct Answer: B
Solution:
$ \underset{\text{lime water}}{\mathop{Ca{{(OH)}_2}\ +\ CO_2}}\xrightarrow{{}}\ \underset{\begin{smallmatrix} white\ \\ precipitate \end{smallmatrix}}{\mathop{CaC{O _{3(S)}}+H_2O}} $
$ CaCO_3+CO_2(\text{excess)}+H_2O\xrightarrow{{}}\underset{soluble}{\mathop{Ca{{(HCO_3)}_2}}} $
BETA
