http://www.ck12.org Chapter 21. Acids and Bases
FIGURE 21.3
FIGURE 21.4
- pH provides a way to talk about the acidity of a solution (the relative concentration of H+) using more
manageable numbers. It is defined by the equation pH = -log [H+]. - A neutral solution has a pH value of 7 ([H+] = 1.0× 10 −^7 ). Acidic solutions have lower pH values (higher
concentrations of H+), and basic solutions have higher pH values (lower concentrations of H+). - The pH of a solution can be approximated by using indicators or measured more precisely by using a pH
meter.