Preparation of standard buffer for calibration of a ph meter the glass electrode used in commercial ph meters gives an electrical response proportional to the concentration of hydrogen ion. to convert these responses to a ph reading, the electrode must be calibrated against standard solutions of known h+ concentration. determine the weight in grams of sodium dihydrogen phosphate (nah2po4 · h2o; fw 138) and disodium hydrogen phosphate (na2hpo4; fw 142) needed to prepare 1 l of a standard buffer at ph 7.00 with a total phosphate concentration of 0.100 m
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