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For the USP table, the volume of NaOH for the pH of 6.2,6.8,7.6 are 8.1mL, 22.4mL, 42.4mlrespectively. From the experimental values to reach the volume of NaOH to reach the

pH values to6.2,6.8,7.6 are 13mL, 31mL, and 51mL respectively. In preparing the buffer solution at the specified pH, relying on the pH meter and add a base until the desired pH is reached would be a better option than relving on the USP table.

Fig: 1