– Set a slow drop rate. For the best, most accurate data, we recommend setting the rate at 2 seconds per drop or slower. A slow rate provides enough time for each drop of titrant to be thoroughly mixed in the solution and the pH sensor (or other sensor) to respond.
– Minimize the volume of solution to be titrated. We recommend 5-10 mL of test solution. Larger volumes will take longer to mix and may require a very slow drop rate for best results.
– Use the Vernier Microstirrer. It helps deliver solution directly to the pH bulb, minimizing the response time. Also, you can run a magnetic stirrer at a very high speed and the Microstirrer will not form a visible vortex, preventing splashing.
– Add only as much distilled water to the solution being titrated as is necessary to cover the bulb of the pH Sensor (or other sensor).
– Use the plastic reagent reservoir that is supplied with the Drop Counter. The reagent reservoir provides a wider diameter and less change in the hydrostatic pressure per unit volume of titrant above the 2-way valve.
– Another advantage of using the plastic reagent reservoir is the pair of 2-way valves, using one for drop rate adjustment, and the other as an on-off valve. This eliminates the need to do a fine adjust during the initial readings, and also allows the user to set a consistent rate.
– If you want to allow for more thorough mixing when you are near the equivalence point, you can also manually release drops at a slower rate for that region of data.