pH

• pH is a measure of the concentration [ ] of hydrogen (H+) ions in a solution.
• pH is measured on a scale of 1 to 14. 
• A  pH of 7, meaning equal [ ] of hydrogen and hydroxide ions, is considered to be neutral.
• A pH greater than 7, meaning the solution has a lower [ ] of hydrogen ions than it does hydroxide ions, is considered to be basic.
• A pH less than 7, meaning the solution has a higher [ ] of hydrogen ions than it does hydroxide ions, is considered to be acidic.

To help you visualize pH a little better, check out this website: http://www.purchon.com/chemistry/ph.htm