Table 1.

The pH profile of the 1 M phosphate buffer prepared by mixing different ratios of 1 M NaH₂PO₄ and 1 M Na₂HPO₄, The experimental values are model fitted using dynamic approach and the back-calculated pH values based on optimized pKa values are tabulated below.

Solution "A" (mL)	Solution "B" (mL)	1 M Phosphate buffer (pH)
(1 M NaH2PO4)	(1 M Na2HPO4)	Experimental	Back calculated
877	123	6.0	5.989
850	150	6.1	6.088
815	185	6.2	6.196
775	225	6.3	6.302
735	265	6.4	6.395
685	315	6.5	6.498
625	375	6.6	6.611
565	435	6.7	6.716
510	490	6.8	6.807
450	550	6.9	6.905
390	610	7.0	7.003
330	670	7.1	7.102
280	720	7.2	7.188