Cracking the AP Chemistry Exam
Content Review for the AP Chemistry Exam
Big Idea #6: Equilibrium, Acids and Bases, Titrations, and Solubility
Many of the concentration measurements in acid-base problems are given to us in terms of pH and pOH.
p (anything)=−log (anything)
In a solution
· when [H+]=[OH−], the solution is neutral, and pH=7
· when [H+] is greater than [OH−], the solution is acidic, and pH is less than 7
· when [H+] is less than [OH−], the solution is basic, and pH is greater than 7
It is important to remember that increasing pH means decreasing [H+], which means that there are fewer H+ ions floating around and the solution is less acidic. Alternatively, decreasing pH means increasing [H+], which means that there are more H+ ions floating around and the solution ismore acidic.