CBSE Class 11-science Answered
what is formality and normality?
Asked by paulomi | 23 Jul, 2013, 09:53: AM
Expert Answer
Formality
Formality, F, is the number of formula weight units of solute per liter of solution.Remember that one mole of a compound has a mass equal to the formula weight in grams. The number of formula weight units is equal to the number of moles for molecular substances.
Normality
It is defines as the number of gram equivalents of solute present per litre of solution. It is denoted by N.
Normality (N) = Number of gram equivalents of solute/Number of litres of the solution
or Normality × Number of llitres of the solution
= Number of gram equivalents of the solute
Let wA gram of the solute of equivalent mass EA be present in V litres of the solution, then,
Normality = wA/EA/V = wA/EA×V
Normality
Answered by | 23 Jul, 2013, 10:17: AM
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