1 g-atom of Ca was burnt in excess of oxygen and the oxide was dissolved in water to make up a one - liter solution. Calculate the normality of the alkaline solution.

Explanation

First Method
`Ca + O_(2) CO overset(H_(2))to Ca (OH)_(2)`
Ca atoms are conserved `:.` applying POAC for Ca atoms,
moles of Ca atoms in reactant = moles of Ca in Ca `(OH)_(2)`
`1 = 1 xx ` moles of `Ca(OH)_(2)`
(`:.` mole of `Ca(OH)_(2)` contains 1 mole of Ca)
`:.` moles of `CaO=(OH)_(2) = 1 `
Since the solution is made up to 1 liter ,
molarity of `Ca(OH)_(20` = 1 M
and normality of `Ca(OH)_(2) = 2 N`
[ Note : In the above problems, the rules applied have been referred to wherever necessary just to make ever step easy to follow. It may, thus, be expected that the students must now have been well acquainted with the rules and their application, and so in the following problems rules have been rarely mentioned except where they are at all required.]