The glass electrode used in commercial pH meters gives an electrical response proportional to the concentration of hydrogen ion. Converting these responses to a pH reading requires calibration of the electrode against standard solutions of known H* concentration. Preparation of the pH 7.00 standard buffer uses sodium dihydrogen phosphate (NaH, PO, H₂O, FW 138) and disodium hydrogen phosphate (Na₂HPO4, FW 142). Phosphoric acid (H, PO,), a triprotic acid, has three pK, values: 2.14, 6.86, and 12.4. Calculate the weight in grams of sodium dihydrogen phosphate and disodium hydrogen phosphate needed to prepare 1.75 L of standard buffer with a total phosphate concentration of 0.10 M. NaH, PO, = 8 . Na₂HPO =

The glass electrode used in commercial pH meters gives an electrical response proportional to the concentration of hydrogen ion. Converting these responses to a pH reading requires calibration of the electrode against standard solutions of known H* concentration. Preparation of the pH 7.00 standard buffer uses sodium dihydrogen phosphate (NaH, PO, H₂O, FW 138) and disodium hydrogen phosphate (Na₂HPO4, FW 142). Phosphoric acid (H, PO,), a triprotic acid, has three pK, values: 2.14, 6.86, and 12.4. Calculate the weight in grams of sodium dihydrogen phosphate and disodium hydrogen phosphate needed to prepare 1.75 L of standard buffer with a total phosphate concentration of 0.10 M. NaH, PO, = 8 . Na₂HPO =

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

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Question

The glass electrode used in commercial pH meters gives an electrical response proportional to the concentration of hydrogen
ion. Converting these responses to a pH reading requires calibration of the electrode against standard solutions of known
H* concentration.
Preparation of the pH 7.00 standard buffer uses sodium dihydrogen phosphate (NaH,PO, H₂O, FW 138) and disodium
hydrogen phosphate (Na₂HPO, FW 142). Phosphoric acid (H,PO,), a triprotic acid, has three pK, values: 2.14, 6.86, and
12.4.
Calculate the weight in grams of sodium dihydrogen phosphate and disodium hydrogen phosphate needed to prepare 1.75 L of
standard buffer with a total phosphate concentration of 0.10 M.
NaH, PO
g
Na₂HPO4 =

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