AP Notes, Outlines, Study Guides, Vocabulary, Practice Exams and more!

Bases

definition - increases the concentration of OH- ions when dissolved in water  

  • Bronsted-Lowry definition - accepts proton from another substance
    • even applies to substances not dissolved in water
  • Lewis definition - electron-pair donor
  • pOH = -log [OH-]
    • pOH = 14 - pH
  • strong base - completely dissociates, [OH-] = [base]
    • hydroxides of alkali metals and heavy alkaline earth metals
  • weak base - partially dissociates
    • Kb = [OH-][conjugate acid] / [base]
    • [OH-] = [conjugate acid] when Kb is very small

Find the pH of 0.0030 M solution of ammonia  

  • Kb = 1.8 x 10-5
  • Kb = [OH-] [ammonium] / [ammonia] = x2 / 0.0030
  • x = [(1.8 x 10-5) (0.0030)]1/2 = 2.3 x 10-4 = [OH-]
  • pOH = -log [OH-] = 3.63
  • pH = 14 - 3.63 = 10.37
Subject: 
Chemistry
Subject X2: 
Chemistry

Need Help?

We hope your visit has been a productive one. If you're having any problems, or would like to give some feedback, we'd love to hear from you.

For general help, questions, and suggestions, try our dedicated support forums.

If you need to contact the Course-Notes.Org web experience team, please use our contact form.

Need Notes?

While we strive to provide the most comprehensive notes for as many high school textbooks as possible, there are certainly going to be some that we miss. Drop us a note and let us know which textbooks you need. Be sure to include which edition of the textbook you are using! If we see enough demand, we'll do whatever we can to get those notes up on the site for you!