પ્રથમ પધ્ધતિ મોલારીટી $ = \,\,\frac{{weight \,\,of\,\,soule\,\, \times \,\,1000}}{{Molecular\,\,\,Weight\,\,of\,\,solute\,\, \times \,\,volume\,\,of\,\,solution\,\,\left( {mL} \right)}}$

$ = \,\,\frac{{0.4}}{{40\,\, \times \,\,40}}\,\, \times \,\,1000\,\, = \,\,0.25\,\,M$

અને  $normality\,\, = \,\,\frac{{weight\,\,of\,\,solute}}{{Equivalent\,\,weight\,\,of\,dolute\,\, \times \,\,volume\,\,of\,\,solution\,\,\left( {ml.} \right)}}\,\,$  $ \times \,\,1000$

$NaOH$ નો તુલ્યભાર $=\,40$

તેથી $, N\,\, = \,\,\frac{{0.4}}{{40\,\, \times \,\,40}}\,\, \times \,\,1000\,\, = \,\,0.25\,$

દ્રિતય પધ્ધતિ $N\,\, = \,\,M\,\, \times \,\,n  $

અહી $n\,\, = \,\,1,\,\,\,\,N\,\, = \,\,M,\,\,\,N\,\, = \,\,0.25$