Question
When a piece of calcium metal is dropped into a beaker of cold water, a vigorous reaction takes place and the metal gradually disappears to form a white suspension.
(i) Write down the equation for the reaction.
(ii) Why does the solution become milky?
(iii) On filtering, a clear solution is obtained. What is the name of the clear solution?
Solution
(ii) As calcium hydroxide is only sparingly soluble, therefore, the solution becomes milky due to the presence of insoluble salt.
iii) On filtering, a clear solution is obtained such as,
