Question

A student has a solution with a pH of 7. The student adds HF, hydrogen floride, to the solution, hoping to increases the pH of the solution. What is wrong with this student's approach?
Select one: A. You cannot change the pH of a solution. B. HF is an acid, so it will lower the pH of the solution. C. The pH of the solution is already as high as possible. D. The pH is 7, so the solution is already as acidic as possible.

Answer 1

Low pH = high acidity.
HF has a very low pH, so when added to a solution, it will lower the pH of the solution and therefore make it more acidic. So the answer should be B.