Abstract
Materials used in the preparation of buffer solutions should be good quality laboratory chemicals, purified if necessary as described in Chapter 8 and dried to constant composition. The distilled water used as solvent should have been recently boiled to remove dissolved carbon dioxide and have been protected from contamination by atmospheric carbon dioxide while cooling. (This precaution is unnecessary in preparing buffer solutions having pH values less than 5.) The water should have a specific conductivity of less than 2 × 10−6 ohm−1 cm−1 at 25° C. Solutions should be stored in stoppered Pyrex (or similar borosilicate glass) or pure polyethylene bottles.
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