There is another type of titration that you need to know, namely argentometric titration. Like the titration function in general, this type of titration is also used to check the level or concentration of the substance. Those of you who are in the world of chemistry must be familiar with the term titration, including this titration method called argentometry.

This one titration method is still being developed into several types of titration methods by prioritizing the formation of deposits. All of these methods will be briefly described in the review below.

Understanding Argentometric Titration

Let's start by first knowing the meaning of argentometric titration itself. This type of titration is specifically used when carrying out precipitation reactions. From the name, you must have got a little clue. Argentometric titration is taken from the Latin "argentum" which means silver.

So, it is not surprising that this precipitation titration uses silver (Ag) in its method. The content of a substance in a certain solution is determined by looking at the precipitation titration process or the formation of silver ion deposits. More precisely it is used to designate silver as well as halide compounds. There are three different methods in argentometric titration, namely the Fajans, Mohr, and Volhard methods.

Procedure

As mentioned above, this titration method relies on the formation of a precipitate. In other words, the content of the analyte (a substance that is tested for its concentration or concentration) is determined by the formation of a precipitate from the titrant (the solution used as the measurement benchmark by titration) of the silver nitrate titer solution.

In argentometric titration, there are three types of methods used. These three titration methods will also be discussed here. The goal is that you can identify what the three methods themselves look like, including how they work.

1. The Fajans Method

This argentometric titration method was first introduced by Kazimierz Fajans. In this method, dichlorofluorescein will be used as an indicator. This indicator will change color to let you know the grade information. When the process has reached its end point, the suspension that was originally green will turn pink.

Usually, before the titration process is complete, there are still excess chloride ions. Then, what happens is this chloride ion will be absorbed onto the silver chlorite surface. This ion adsorption process will affect the color in the indicator later.

Also read: Definition, How it Works, and Types of Acid-Base Titration

2. Mohr's method

The next method is the Mohr method. This titration method was introduced and named after Karl Friedrich Mohr. In the process of this Mohr titration method, the indicators used are definitely different from the Fajans Method earlier. Here, potassium chromate is used as an indicator. If all the chloride ions react, you will produce red silver chromate.

It is best not to test or check carbonate and phosphate levels using this method as they will both settle with silver. The results will also not be very accurate later. This method can mainly be used to check the chlorine content. You can do this by using other samples such as calcium and iron acetate.

3. The Volhard Method

Finally, the type of argentometric titration method that can also be used is the Volhard method. Jacob Volhard is the person behind this titration method. In his method, Volhard also added this excess of silver nitrate to the analyte. Then, the silver chloride will be filtered so that the remaining silver nitrate can be titrated against the solution to be checked for the substance content.

For the indicator, the Volhard method uses ferrous ammonium sulfate. At the end result of the titration process, this indicator will change color to blood red. You can also use indicators such as ferric salt solution (Fe3 +) as an alternative indicator when doing this method.

Like other titration processes, the titration methods discussed earlier also involve many tools and materials. The material is primarily an indicator or reagent substance (titrant) itself. Then, the tools will be adjusted according to the needs. However, generally the titration tool is a laboratory device that you are already familiar with. It takes a titration tool and accurate materials to get accurate results too. That's why you need to find out more if you really want to do a titration. Especially about how to practice the argentometric titration method.

Also read: How to Use Karl Fischer Titration You Need to Understand