F asked in Science & MathematicsChemistry · 6 months ago

What is the pH of a solution containing 0.27 M HCOOH and 0.33 M HCOOK? The Ka for HCOOH is 1.7 × 10−4.?

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  • david
    Lv 7
    6 months ago

    Ka = [H+][HCOO-]/[HCOOH]

    1.7x10^-4  =  x(0.33+x)/(0.27-x)  <<<  x is small, "round"

    1.7x10^-4 = x(0.33)/(0.27)  <<< solve for x

      x = [H+] = 1.3909x10^-4  <<<  round for sig figs

      pH = 3.8567  <<<  round for sig figs  ... that is your job to finish the problem

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