A solution is prepared by dissolving 0.121 g uric acid, C 5 H 3 N 4 O

Question:

A solution is prepared by dissolving 0.121 g uric acid, C₅H₃N₄O₃H (molar mass = 168 g/mol), and diluting to make exactly 10 mL of solution. Each uric acid molecule has only one hydrogen ion that dissociates. Conductivity measurements indicate that the acid is 4.2% ionized. Calculate Ka for uric acid, a compound that plays an important role in gout.