Then the remaining amount of EDTA present in the sample is determined using a Mg+2 solution in the presence of EBT indicator. Difference Between Back Titration and Direct Titration, What is the Difference Between Back Titration and Direct Titration. Compare the Difference Between Similar Terms. Under these circumstances, the solid … Titration is a process which calculates the property of one solution (molarity) to generalize another unknown property of a solution. Let us consider an example in order to understand this concept. Firstly, CaCO3 tablets are poorly water-soluble but dissolve rapidly in acid. 1. However, the key difference between titration and back titration is that in a titration, we usually add a chemically equal amount of standard solution to the analyte whereas, in a back titration, we add an excess amount of standard solution to the analyte. Such analytes include acids, bases, oxidants, reductants, and metal ions. Back titration is a technique which can be used in the analysis of solids that are insoluble, or only partly soluble in water. The main difference between back titration and direct titration is that a back titration determines the concentration of the unknown by determining the remaining amount of the compound with a known concentration whereas a direct titration directly measures the concentration of the unknown compound. Main Difference – Acid-Base Titration vs Redox Titration. A back titration is useful in determining the concentration of an unknown using an excess amount of a compound with a known concentration. However, in a back titration, there are two chemical reactions taking place in the same sample. By using that endpoint, the amount of unknown compound present in the sample solution can be determined. Titration is a chemical process which is widely used in analytical chemistry to determine oxidants, metal ions, reductants, acids and bases. Here, an analyte reacts with a standard reagent, which we call the “titrant”. Here, we can determine this remaining amount of standard reagent using a back-titration. Sometimes, the end point of titrations cannot easily be obtained due to the sharp color changes that occur at the endpoint. The color of free EBT is blue. A back titration does not involve a direct reaction between the titrant and the titrand. Metal ions always form complexes with EDTA in 1: 1 ratio. Since the amount of the compound with a known concentration added is known already, we can determine the amount of the compound that has reacted with the unknown compound by doing a back titration. Back titrations are used when: one of the reactants is volatile, for example ammonia. We can detect the end-point using an indicator which can change its colour at the endpoint. Furthermore, in the sample of a normal titration, only one chemical reaction takes place. In a titration, the titrant is in the burette, and we add the analyte to the titration flask using a pipette. Summary. Direct Titration: A direct titration is the basic titration method that involves the reaction between the unknown compound and the compound with known concentration. However, the key difference between titration and back titration is that in a titration, we usually add a chemically equal amount of standard solution to the analyte whereas, in a back titration, we add an excess amount of standard solution to the analyte. This is performed using a set of special apparatus. The main difference between back titration and direct titration is that a back titration determines the concentration of the unknown by determining the remaining amount of the compound with a known concentration whereas a direct titration directly measures the concentration of the unknown compound. 2. However, we should have an idea about the unknown compound; otherwise, we cannot determine the solution of the known concentration that should be used for this identification. This is because the endpoint is given when the indicator used in the titration give its color change. Therefore, the end point of the titration indicates the end of the reaction. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Changes in the current are due to changes in the concentration of a particular species (being oxidized or reduced at the electrode). 5. All rights reserved. Joseph Louis Gay-Lussac, this gay d… Back titration is an analytical chemistry technique which allows the user to find the concentration of a reactant of unknown concentration by reacting it with an excess volume of another reactant of known concentration. Back titration was required for two reasons. Accessed 18 Sept. 2017. Back Titration vs Direct Titration. There are some errors associated with titrations as well. In a titration, there are two components involved: a titrant and a titrand. Since the amount of the compound with a known concentration added is known already, we can determine the amount of the compound that has reacted with the unknown compound by doing a back titration. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2010-2018 Difference Between. Her interest areas for writing and research include Biochemistry and Environmental Chemistry. In type of titration the point is identified where analyte and reagent are present in equivalent amounts. Titrations can be done in various ways and there are several types of titrations. Side by Side Comparison –Titration vs Back Titration in Tabular Form What is Back Titration The resulting mixture is then titrated back, taking into account the molarity of the excess which was added. Therefore, it is very important to determine the exact point where the reaction ends. The concentration of the EDTA solution should be determined later using a primary standard. Titration is a widely used laboratory technique for the quantification of chemical analytes by means of their concentration. The endpoint of a titration indicates the end of the reaction between the unknown compound and the known compound. We should use an ideal standard solution in titrations, and it should have several properties such as chemical stability and ability to react rapidly and completely with the analyte. In most cases this is virtually identical to the inflection point of the titration curve, for example with titration curves obtained from acid/ base titrations. Back titration is one such type. In back titration you find the concentration of a species by reacting it with an excess of another reactant of known concentration. A back titration is a titration method used to determine the concentration of an unknown using an excess amount of a compound with a known concentration. A conventional method for volumetric analysis where a titrant is added to the analyte or desired substance is called titration. Titrand is the analyte or the sample. “What Is a Back Titration?” ThoughtCo, Accessed 18 Sept. 2017. Direct Titration: Direct titrations are used when the endpoint of the titration can easily be obtained. Direct Titration: The titrand of the direct titration is the unknown compound. Overview and Key Difference Home » Science » Chemistry » Analytical Chemistry » Difference Between Back Titration and Direct Titration. The key difference between titration and back titration is that in a titration, we usually add a chemically equal amount of standard solution to the analyte whereas, in a back titration, we add an excess amount of standard solution to the analyte. 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