Calculate the pH of a 0.340M NaO2CCO2H solution. pKa1 = 1.250 and pKa2 = 4.266. Apparently the...

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Calculate the pH of a 0.340M NaO₂CCO₂Hsolution. pK_a1 = 1.250 and pK_a2 = 4.266.Apparently the answer is 2.79 but can someone explain this?
a. -0.029
b. 3.38
c. 2.79
d. 4.89
e. 2.37

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4.4 Ratings (937 Votes)

answer : e) 2.37

NaO2CCO2H <-----------------------> NaO2CCO2- + H+

0.34Â 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 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

0.34 - xÂ 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 Â Â Â Â Â Â Â Â Â Â Â Â Â Â xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â x

Ka2 = x^2 /0.34 - x

5.42 x 10^-5 = x^2 /0.34 - x

x = [H+] = 4.30 x 10^-3 M

pH = -log [H+] = -log (4.30 x 10^-3)

pH = 2.37

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