The formula pH = -log[H+] is used to determine how acidic or basic a liquid is. [H+] represents the concentration of hydrogen ions in the liquid. You are given a sample that has a hydrogen ion concentration of 0.0065 and a pH level of about 2.2. Which of the following changes would cause the pH level to double?
a) Make the [H+] concentration ten times larger;
b) Make the [H+] concentration two times smaller;
c) Make the [H+] concentration 200 times larger;
d) Make the [H+] concentration 200 times smaller.