what is formality and normality?

Asked by paulomi | 23rd Jul, 2013, 09:53: AM

Expert Answer:

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.
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

Answered by  | 23rd Jul, 2013, 10:17: AM

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