1 / 11

pH ( power of hydronium ion)

pH ( power of hydronium ion). The pH scale is a way of expressing the strength of acids and bases. Instead of using very small numbers, we just use the NEGATIVE power of 10 on the Molarity of the H + (or OH - ) ion. Under 7 = acid 7 = neutral Over 7 = base. pH = -log[H + ].

bellini-fadden
Download Presentation

pH ( power of hydronium ion)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. pH(power of hydronium ion)

  2. The pH scale is a way of expressing the strength of acids and bases. Instead of using very small numbers, we just use the NEGATIVE power of 10 on the Molarity of the H+ (or OH-) ion.Under 7 = acid7 = neutralOver 7 = base

  3. pH = -log[H+] Example: If [H+] = 1 X 10-10pH = - log 1 X 10-10 pH = - (- 10) pH = 10 Example: If [H+] = 1.8 X 10-5pH = - log 1.8 X 10-5 pH = - (- 4.74) pH = 4.74

  4. pH

  5. A pH change of 1, means a 10X change in [H+]

  6. Learning Check: What is the pH when: [H+] = 1 X 10-2M? pH = 2 What is the [H+] when the pH is: 3? 1 X 10-3 7? 1 X 10-7

  7. Ionization of Water H2O(l) ⇌ H+(aq) + OH-(aq) KEQ = [H+] [OH-] = 1 X 10-14 X X X2 = 1 X 10-14 X = 1 X 10-7 [H+] = [OH-] = 1 X 10-7 pH = 7

  8. Ionization of Water H2O(l) ⇌ H+(aq) + OH-(aq) What happens if you add more base? [H+] [ OH- ] *inverse relationship LeChatelier: H2O(l) ⇌ H+(aq) + OH-(aq)

  9. Learning Check: If [H+] [OH- ] = 1.0 X 10-14, what is the pH of a solution with [OH- ] = 1.0 X 10-6M? [H+] [OH- ] = 1.0 X 10-14 (X)1.0 X 10-6 = 1.0 X 10-14 X = 1.0 X 10-8 pH = 8 What is the pH if [OH-] = 1 X 10-2M? pH = 12

  10. Indicators • Substance which changes color in a specific pH. • Table M

More Related