Conductiviy titrations analytical chemistr ynew

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Barium sulfate, for example, is insoluble and remains as BaSO4 (s) when added to water, and thus cannot affect the concentration of the water. Magnesium hydroxide is only slightly soluble, so even though the ions conduct well, their concentration is low and there is little conductance in a solution above solid Mg(OH)2.

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Conductiviy titrations analytical chemistr ynew

  1. 1. Conductivity titrations-CHM 240 By Dr. Robert D. Craig, Ph.D. .
  2. 2. Conductivity titrations-CHM 240• The electric conductivity of aqueous electrolyte solutions is determined by the type and number of charge carriers at constant temperature.• Characteristic changes in conductivity are connected with changes in the ionic composition of reacting systems.
  3. 3. Conductivity titrations-CHM 240
  4. 4. Conductivity titrations-CHM 240
  5. 5. What you can learn about . .ElectrolyteElectrical conductanceSpecific conductanceIon mobilityIon conductivityConductometryVolumetry
  6. 6. . Conductivity titrations-CHM 240
  7. 7. .• The basic unit of conductivity is the siemens (S), formerly called the mho.
  8. 8. .• . Since cell geometry affects conductivity values, standardized measurements are expressed in specific conductivity units (S/cm) to compensate for variations in electrode dimensions
  9. 9. .• Specific conductivity (C) is simply the product of measured conductivity (G) and the electrode cell constant (L/A), where L is the length of the column of liquid between the electrode and A is the area of the electrodes (see Figure 1).• C = G x (L/A)
  10. 10. C = G x (L/A)
  11. 11. Conductivity titrations-CHM 240
  12. 12. Experimental setup of coulometric titration “Start of titration”
  13. 13. measure the change in conductivity in the titrations of the following:• approximately 0.1 molar barium hydroxide solution with 0.1 molar sulphuric acid,• approximately 0.1 molarhydrochloric acid with 0.1 molar sodium hydroxide solution and• approximately 0.1 molar acetic acid with 0.1 molar sodium hydroxide solution• Other samples can alternatively be set in advance for conductiometric determination of their concentration contents.
  14. 14. Websites used• http://www.eutechinst.com/techtips/tech- tips25.htm
  15. 15. Websites used• http://www.phywe.com/461/pid/26717

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