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1 Ratio of the salt to the acid or base. 2  The buffer capacity is optimal when the ratio is 1:1; that is, when pH = pKa. 3  Total buffer concentration. 4  For example, it will take more acid or base to deplete a 0.5 M buffer than a 0.05 M buffer.
The total uncertainty factor of our standard buffer solutions is. max. Â± 0,01 pH units, except solutions pH 10, 11, 12 and 13, where two point calibration is performed and uncertainty is max. Â± 0,02 pH units.