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

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Chemistry

Estimate the pH of the resulting solution prepared by mixing 1.0mole of solid disodium phosphate and 1.25 mole of hydrochloricacid. The pKas of phosphoric acid are 2.1,7.2,12.4. The answer is2.1

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3.8 Ratings (757 Votes)

first equilibrium

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

1.0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 1.25Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0

0.0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.25Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 1.0Â Â Â Â Â Â Â Â Â Â Â Â 1.0

second equilibrium

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

1.0Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.25Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0

0.75Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.25Â Â Â Â Â Â Â Â Â Â Â 0.25

pHÂ Â Â = 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

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

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50.1K

Verified Solution

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Chemistry

Estimate the pH of the resulting solution prepared by mixing 1.0mole of solid disodium phosphate and 1.25 mole of hydrochloricacid. The pKas of phosphoric acid are 2.1,7.2,12.4. The answer is2.1

Answer & Explanation Solved by verified expert

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