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In the Laboratory PowerPoint PPT Presentation


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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

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In the Laboratory

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In the laboratory

pH

In the Laboratory


Ionization of water

Ionization of Water


Equllibrium constant k eq

Equllibrium Constant, Keq


Ion product of water k w

Ion Product of Water, KW


In the laboratory

pH


Acidity

Acidity


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) = ?


Ph of a weak acid

pH of a Weak Acid


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