Question

A new potential heart medicine, code-named X-281, is being testedby a pharmaceutical company, Pharma-pill. As a research technicianat Pharma-pill, you are told that X-281 is a monoprotic weak acid,but because of security concerns, the actual chemical formula mustremain top secret. The company is interested in the drug's valuebecause only the dissociated form of the chemical is active inpreventing cholesterol buildup in arteries.
To find the of X-281, you prepare a 0.083 test solution of X-281.The pH of the solution is determined to be 3.00. What is the ofX-281?

Express your answer numerically.