It is observed that Calcium on reaction with water floats on its surface. Explain why it happens. Also write…
It is observed that Calcium on reaction with water floats on its surface. Explain why it happens. Also write a balanced chemical equation for the reaction that occurs. What happens when the aqueous solution of the product of this reaction reacts with Carbon dioxide gas ? Write a balanced chemical equation for the reaction.
Solution
Bubbles of hydrogen gas formed stick to the surface of calcium and make it lighter than water.
Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g)
The solution formed turns milky.
Ca(OH)2 (aq) + CO2(g) → CaCO3(s) + H2O(l)