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Titrator How To Determine The Titration End Point
Aug 10, 2017

The principle of the potential method is: the selection of the appropriate indicator electrode and the reference electrode and the measured solution to form a working battery, with the addition of the titrant, due to chemical reactions, the measured concentration of ions continue to change,Titrator thus indicating the electrode potential With the change. At the end of the titration end, the measured ion concentration changes abruptly, causing the electrode potential to jump. Therefore, the titration end point can be determined based on the electrode potential jump.

There are two parts of the instrument and the titration system. The electric charge adopts the electronic amplification control circuit, compares the potential between the indicator electrode and the reference electrode with the preset terminal potential, and the difference between the two signals is controlled by amplification. System drip rate. When the end preset potential is reached,Titrator the titration stops automatically. The instrument is divided into two parts: electric meter and titration system.

A number of titrator instrument in the measured solution before the first calibration, in continuous use, the calibration once a day can be calibrated by a little bit of calibration and two-point calibration method, conventional measurement using a little calibration method, accurate measurement Using two-point calibration method. The instrument can be used for various types of potentiometric titration, the user according to the different electrodes, insert the rear panel of the electrode jack, if the electrode can not be directly inserted into the Q9 jack, you can use the instrument to provide Q9 plug; Alligator can hold the electrode head.

In the titration of a number of titrators, a reference electrode is inserted into the measured solution, and an indicator electrode is used to form the working battery. With the addition of the titrant, due to the chemical reaction 2. The measured ion concentration is constantly changing, indicating that the potential of the electrode also changes accordingly. A sudden jump occurs near the waiting point. So measure the working battery 3. The change of the electromotive force can determine the end point of the titration.

2 more than titrator titration of the basic instrument device, including burette, titration cell, indicating electrode, reference electrode, stirrer, measuring electromotive force of the instrument.

3 titration is how to determine the end of the titration? The method of determining the curve by plotting the potential.

4 titration curve that is with the titration of the electrode potential (battery electromotive force) E on the standard solution to join the volume V graphics.

5 According to the mapping method, there are three types of potential titration curve, E-V curve, ordinary potential titration curve, inflection point e is equivalent point.

6 to determine the inflection point, for the two with the titration curve tangent 45 ° inclined line, bisector and the intersection of the curve that is the inflection point.