Question

multiple choice 1 point pure water has a ph of 7. if you add an acid to water, what happens? ph remains at 7 ph decreases below 7 ph increases above 7 ph becomes exactly 7.5

Explanation:

Acids increase the hydrogen - ion concentration in a solution. Since pH is a measure of hydrogen - ion concentration (pH = -log[H⁺]), an increase in hydrogen - ion concentration leads to a decrease in pH. Pure water has a pH of 7, and adding an acid will make the solution acidic, thus decreasing the pH below 7.

Answer:

pH decreases below 7