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Part A A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company,...

Part A A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research technician at Pharma-pill, you are told that X-281 is a monoprotic weak acid, but because of security concerns, the actual chemical formula must remain top secret. The company is interested in the drug's K a value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries. To find the p K a of X-281, you prepare a 0.086 M test solution of X-281 at 25.0 ∘ C . The pH of the solution is determined to be 2.40. What is the p K a of X-281? Express your answer numerically.

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