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pKa is 8.60. What must be the minimum concentration of hypobromous acid in 1.00 L buffer solution of a pH 8.34 hypobromous acid/sodium hypobromite buffer if the pH changes by 0.20 units when 0.067 moles
a. 0.05 M
b. 0.10 M
c. 0.15 M
d. 0.20 M