While a student was shifting the dilute HCl bottle, it accidentally slipped from his hand and fell on the marble floor. Brisk effervescence was observed by him. Can you explain why?
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Answer:
Reaction involved-
CaCO
3
+2HCl→CaCl
2
+CO
2
+H
2
O
The evolved gas is carbon dioxide which when passes through lime water turns it milky.
Ca(OH)
2
+CO
2
→H
2
O+CaCO
3
⇐ due to formation of this compounds
when excess CO
2
is passed
CaCO
3
+H
2
O+CO
2
→Ca(HCO
3
)
2
Bicarbonate is formed which again clears the solution.
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