Question
In: Chemistry
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.
Solutions
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 1 year agoRelated Solutions
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