Conductimetric Titration - 2 of 2
As barium hydroxide is slowly added to the acid, hydrogen ions from the acid react with hydroxide ions from the base to form neutral water molecules. Sulfate ions from the acid react with barium ions from the base to form insoluble barium sulfate. The solution's conductivity gradually decreases, as indicated by the decrease in the noise generated by the device, and eventually by the dimming of the lights. The decrease in conductivity of the solution results from a decrease in the concentration of ions. Since neither the water nor the barium sulfate generates free ions in solution, the conductivity approaches zero. Once all of the acid is used up, addition of barium hydroxide again results in an increase in concentration of ions in solution, so the conductivity begins to rise.
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