Conductivity was measured as concentration of the solution was gradually increased by the addition of concentrated NaCl drops. A computer-interfaced conductivity probe was be used to measure conductivity of the solution. They also saw the effect of ions, precipitates, and water on conductivity. 2 SO 4 are almost completely dissociated into their respective ions. Neither of the reaction products, however, is significantly dissociated.
Barium sulfate is a precipitate and water is predominantly molecular.
When the probe was placed in a solution that contains ions, and thus has the ability to conduct electricity, an electrical circuit was completed across the electrodes that are located on either side of the hole near the bottom of the probe body. This resulted in a conductivity value that can be read by a computer. A computer-interfaced pH electrode was placed in one of the acid solutions. A solution of one of the bases was slowly dripped from a buret into the acid solution at a constant rate. As base was added to the acid, there was a gradual change in pH until the solution got close to the equivalence point.