When water is added gradually to a white solid X, a hissing sound is heard and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of a house during white washing. A clear solution of Y is also used for testing carbon dioxide gas in the laboratory.
(a) What could be solid X? Write its chemical formula.
(b) What could be product Y? Write its chemical formula.
(c) What is the common name of the solution of Y which is used for testing carbon dioxide?
(d) Write chemical equation of the reaction which takes place on adding water to solid X?
(e) Which characteristic of chemical reactions is illustrated by this example?
a) Solid X is Calcium oxide, also known as quicklime and its formula is CaO.
b) Product Y is Calcium hydroxide, commonly known as slaked lime and its formula is Ca(OH)2.
c) The common name of the solution of Y, which is used for testing carbon dioxide gas, is Lime water.
d)The chemical equation of the reaction that takes place on adding water to solid X is given below:
$\ CaO\ ( s) \ +\ H_{2} O\ ( l) \ \rightarrow \ Ca( OH)_{2} \ ( aq) \ +\ Heat$
e) The characteristic of the chemical reaction is a change in temperature, as a huge amount of heat is evolved during this reaction.
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