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Estimate the pH of the resulting solution prepared by mixing 1.0 mole of solid disodium phosphate...

Estimate the pH of the resulting solution prepared by mixing 1.0 mole of solid disodium phosphate and 1.25 mole of hydrochloric acid. The pKas of phosphoric acid are 2.1,7.2,12.4. The answer is 2.1<pH<7.2. Please explain.

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Expert Solution

first equilibrium

Na2HPO4 + HCl -----------------------------> NaH2PO4 + NaCl

1.0                1.25                                           0                  0

0.0                 0.25                                       1.0             1.0

second equilibrium

NaH2PO4 + HCl --------------------> H3PO4 + NaCl

1.0               0.25                            0                0

0.75              0                              0.25            0.25

pH    = pKa1 + log [NaH2PO4 / H3PO4 ]

pH = 2.1 + log (0.75 / 0.25)

pH = 2.58

2.58 is in between 2.1 to 7.2 . so answer is satisfied

queen_honey_blossom answered 7 months ago
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