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 \(n\,\, = \,\,1,\,\,\,\,N\,\, = \,\,M,\,\,\,N\,\, = \,\,0.25\)