Conductimetric Titration ---------------------------------------------------------- Purpose: To show the conductimetric titration procedure. Relates to precipitation, solubility, ions in solution, and conductivity. Materials: buret filled with 0.1M H2SO4 water saturated (~0.14M) Ba(OH)2 solution (22g/500mL) conductivity apparatus magnetic stirrer and bar ring stand with apparatus mounted as needed Procedure: Place enough water in 400 ml beaker so that conductivity probe reaches liquid. Adjust stirring. Add 10 ml of Ba(OH)2. Begin titrating with H2SO4; addition can be rapid for a few milliliters, but must proceed dropwise slowly as endpointed is approached. At endpoint, conductivity approaches zero. If endpoint is passed, conductivity will increase. Disposal: Barium cation is a Class B chemical, and may be drain disposed up to 1 gram per day, according to (2007) interim guidelines. Sulfate anion is a Class A chemical, and may be drain disposed up to about 100 g/day, after neutralization Discussion: [ TBD Ba(OH)2 + H2SO4 --> BaSO4 + 2H2O ] LCM