Additional Related Projects

• Determine the pzc of a unknown solid metal (hydr)oxide by mass titration. For this, add small amounts of the solid to an aqueous solution and measure the pH. The pzc is the point where an additional amount of solid does not produce further pH change. (See Preocanin, 1998).

• Determine the heat of immersion of an unknown solid metal (hydr)oxide and use a known correlation (see Healy, 1965) to estimate its pzc.

• Determine the pzc of an unknown solid metal (hydr)oxide by a differential potentiometric titration. To this end, titrate a suspension of the solid and plot [H+] vs. pH. At the pzc there is an inflexion point. If one takes the differential curve, there is an easily recognizable maximum at that point. (See Bourikas, 2005).

• Determine experimentally the total concentration of surface sites, {5tot} of an unknown solid metal (hydr)oxide by allowing complex cobalt hexaam-mine ions to exchange with the cations in the solid. Quantify the amount of complex remaining in solution after equilibration. (See Davranche, 2003).

• Determine the surface charge, Q of an unknown solid metal (hydr)oxide by titration as a function of pH. (See Davranche, 2003).

• Calculate the surface acidity constants, Kai and Ka2 from the titration data obtained in the previous project. (See Davranche, 2003).



5. The Point of Zero Charge of Oxides _Date_


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