Tips for Performing Conduction, pH and Thermo titration
· Calibrate the pH and Drop counter.
· Use 1.0 molar acid and base.
o This concentration is high enough to have significant thermometric changes.
· Use Strong acids such as HCl and bases such as NaOH.
o Strong acids and bases fully dissociate making a pronounced peak at the equivalence point as water is formed.
· Use a drop rate of one drop per second.
o A slow drop rate gives the solution time to migrate into the conductivity sensor.
· Use a large stir bar. Not the micro stir bar that comes with the drop counter.
o A large stir bar allows the solution to be evenly distributed around all of the sensors.
· Do not stir fast enough to have a vortex
o A vortex will cause air bubbles to enter the conductivity probe
· Soak the conductivity sensor before use and have enough solution to cover the holes on the sides of the conductivity sensor. Gently tap any bubbles out of the sensor.
· Use the highest setting (tidal wave) on the conductivity sensor.
· Use a fast response temperature sensor.
o A fast response temperature sensor is required to ensure the inflection of the temperature coincides with the equivalence point. A stainless steel probe will respond too slowly.
Creation Date: 10/17/2014
Last Modified: 10/24/2014