Question

A new potential cure for the common cold, code-named Z-123, is being tested by a pharmaceutical company. As a research technician, you are told that Z-123 is a monoprotic weak acid, and the company is interested in the drug's pKa value. To find the pKa of Z-123, you prepare a 0.077 mol/L test solution of the drug. The pH of the solution is determined to be 2.88. What is the pKa of Z-123? Express your answer to two decimal places. pKa

Answer 1

The pKa of Z-123 can be found by taking the negative logarithm of the hydrogen ion concentration ([H+]) in the solution. In this case, the pH of the solution is 2.88, so the pKa of Z-123 is 2.88.

Step-by-step explanation:

The pKa value of Z-123 can be determined by using the pH value of the solution. In this case, the pH of the solution is 2.88. The pKa is calculated by taking the negative logarithm of the hydrogen ion concentration ([H+]) in the solution.

Using the formula pH = -log[H+], we can rearrange the equation to solve for [H+]. [H+] = 10^(-pH), so [H+] = 10^(-2.88). Therefore, the pKa of Z-123 is 2.88.