The PH of an Acidic Solution Is a Measure of the Concentration

Multiple Choice

The pH of an acidic solution is a measure of the concentration of the acid particles in the solution,with smaller values of the pH indicating higher acid concentration.In a laboratory experiment,the pH of a certain acid solution is changed by dissolving over-the-counter antacid tablets into the solution.In this experiment,the pH changes according to the equation $\mathrm { pH } = 5.14 + \log \left( \frac { x } { 0.40 - x } \right)$ , where x is the number of grams of antacid added to the solution.What is the pH of the solution after the addition of 0.05 grams of antacid tablet?

A) 5.99
B) 4.02
C) -0.85
D) 4.29
E) 5.14