chicalapingpon3786 chicalapingpon3786
  • 20-10-2017
  • Chemistry
contestada

Calculate the ph of a solution that is 0.278 m in sodium formate (nahco2) and 0.222 m in formic acid (hco2h). the ka of formic acid is 1.77 × 10^-4.

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akiyama316
akiyama316 akiyama316
  • 30-10-2017
Use the formula:

pH = pKa + log[Conjugate base] / [Acid]

      =  -log(1.77 × 10^-4)  + log[0.278] / [0.222]

     =   3.75 + 0.097
     = 3.84
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