slide1 n.
Download
Skip this Video
Download Presentation
In the Laboratory

Loading in 2 Seconds...

play fullscreen
1 / 13

In the Laboratory - PowerPoint PPT Presentation


  • 65 Views
  • Uploaded on

pH. In the Laboratory. Ionization of Water. Equllibrium Constant, K eq. Ion Product of Water, K W. pH. Acidity. Measuring pH. Indicater Dyes; Methyl Red, Phenol Red, etc. pH Paper (Litmus Paper) pH Meter. pH Meter. Voltmeter with electrode

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'In the Laboratory' - burton-rhodes


Download Now 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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

pH

In the Laboratory

measuring ph
Measuring pH
  • Indicater Dyes; Methyl Red, Phenol Red, etc.
  • pH Paper (Litmus Paper)
  • pH Meter
ph meter
pH Meter
  • Voltmeter with electrode
  • Measures electrical potential difference across electrode due to protons
  • 1 pH unit = 60 mV
  • pH also dependent on temperature
ph electrode
pH Electrode
  • Filled with reference solution (4 M KCl, sat. AgCl)
  • Glass semi permable (protons cannot cross)
  • Glass protected by plastic sleeve
  • Some are sensitive to Tris buffer
ph standards
pH Standards
  • Color coded 4, 7, and 10
  • Potassium Hydrogen Pthalate
  • Standardize everyday
  • Bracket pH range
ph of strong acids
pH of Strong Acids
  • HCl <-> H+ +Cl-
  • Assume complete dissociation
  • 1 M HCl, pH = -log [H+] = -log 1 = ?
  • 0.5 M HCl, pH = -log 0.5 = ?
  • 6 M HCl, pH = -log 6 = ?
ph of strong bases
pH of Strong Bases
  • NaOH <-> Na+ + OH-
  • Assume complete dissociation
  • pKW = pH + pOH = 14
  • pH = 14 – (-log [OH-])
  • 1 M NaOH, pH = 14 – (-log 1) = ?
  • 0.01 M NaOH, pH = 14 – (-log 0.01) = ?
  • 6 M NaOH, pH = 14 – (-log 6) = ?