Potentiometric titration is one of the techniques in chemistry used to measure the concentration of a sample material that has a potential function contained in an electrochemical cell. In the world of chemistry, this technique is often used to determine the equivalence point in a titration which is a substitute for visual indicators. This is because potentiometric titrasin has a higher level of accuracy than visual titration, so the results obtained will be more maximal.
Potentiometric Titration Procedure
In carrying out the potentiometric titration process, tools are usually required such as a comparative electrode, a potential measuring device called a titrator, and an electrode indicator as a marker of the calculation process. Meanwhile, this potential gauge can be a pH meter or a potentiometer. On the potentiometer, the calculation will be done every time there is an additional titrant. When the potential value is relatively stable and does not change despite the addition of the titrant, the addition of the titrant can be stopped.
Measurement of Potentialometric Titration Results and Their Functions
Potentiometric titration can be measured by making a comparison curve between the potential (volts) and the milliliter volume of the titrant. The relationship that occurs between the cell potential with the concentration of liquid volume can also be calculated using the Nerst equation. This nerst equation is the equation found in the pressure and concentration of an electrode solution (cathode and anode). The method of calculation is the number of cell potentials reduced by the number of electrons divided by the reaction coefficient between the right product and the reactants per reactant.
Meanwhile, for potentiometric titration devices involving H + ions in the solution an additional measurement is made using a pH meter, a measuring device that uses an electrode indicator in the form of an electrode membrane. There is a comparison electrode in the form of a calomel glass dipped in the solution to be measured. Potentiometric titration functions to measure redox titrations, complexometry, acid base and deposition.
Mettler Toledo Indonesia Titrator Products
One of the most popular titrator machines on the market and no doubt is the Potentiometric Compact Titrator released by Mettler Toledo Indonesia. This tool is specially designed so that its use is simple and easy to operate. Potentiometric Compact Titrators which have various functions can determine the total acid number, which is the amount of acid content contained in phosphate ester fluid in turbine hydraulic control.
How to Use the Mettler Toledo Automatic Titrator
The titrator must be activated and will enter "pre-titration" mode first. This is done so that excessive deviations such as the presence of moisture can be detected first and discarded before adding the titrant solution. Then, after the titrator has finished the pre-titration process and the deviation has been measured low, the titrator will switch to the "ready" mode. Next, you can put the solution to be tested into the vessel on the titrator. The titrator will then add all the moisture values ??during the test.
To determine the titrant, you can do several steps, namely by determining the main standard, entering the sample volume and then standardizing the titrant and selecting the check mark. You can also use a variety of reagents such as ethanol, methanol, KF reagents for ketones, and additional reagents such as formamide or chloroform. You can also use this tool to easily determine the sample weight before testing the amount of acid content in the sample. You can contact Hyprowira who is the official distributor of Mettler Toledo Titrators in Indonesia.