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Lecture Comments (2)

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Post by Paul Ferreira on July 2, 2012

Yes I must admit, I also do not know how the Dr arrived at some of the calculations.

But I needed to watch a pile of other sites videos to understand these calculations.

Thus the benefit of this lecture was somewhat diluted.

I shall give this one more shot to see if indeed it was worth the investment.

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Post by Okwudili Ezeh on February 20, 2011

His presentation was some what confusing. I did not understand haw he arrived at some of his numbers.

Titrations, Indicators, Buffers

  • Equipment for titration: pipet, buret, volumetric flask

  • n = MV applies both to mol./L and to mmol/mL

  • Do calculations at several points in strong acid/strong base titration

  • Do calculations at several points in weak acid/ strong base titration; and stong acid/weak base titration

  • pH at equivalence point in weak acid/strong base titration is basic; in strong acid /weak base titration is acidic

  • Indicators are weak acids or bases with different colors in neutral and ionic forms

  • Indicators are most useful at pH close to their pK

  • Buffer solutions resist pH change if diluted, or if small amounts of strong acids or bases are added; useful in chemical and biochemical work

  • Buffer solutions are made from weak acids and their salts; or weak bases and their salts

Titrations, Indicators, Buffers

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Titration and Analysis 0:43
    • Equipment: Burets, Pipet, Stopcock, Volumetric Flask
    • Molarity
  • Strong Acid-Strong Base Titration 6:16
    • Example: Sodium Hydroxide and Hydrochloric Acid
  • Weak Acid-Strong Base Titration 16:45
    • Example: Acetic Acid and Sodium Hydroxide
  • pH Meter 28:48
    • pH Electrode: Logarithmic Change to Hydronium
  • Indicators 32:10
    • Example: Indicator and Hydronium
    • Phenolphthalein
    • Methyl Orange
  • Theory and Choice of Indicators 39:19
    • Indicator Visibility if Factor of 10
  • Buffers 42:47
    • What is a Buffer Solution?
    • Acetate Buffer and Ammonium Buffer
    • Example: Buffer Effects
  • Buffer Regions in Titrations 51:38
    • Example: Acetic Acid and Sodium Hydroxide
  • Practical Buffers 55:17
    • Example: Acetic Acid and Acetate Ion (pH Range)
  • Additional Example 1