BACK TITRATION Back titration is a process in which the excess of a standard solution used to consume an analyte is determined by titration with a second standard solution. Example: Determination of acetylsalicylic acid in aspirin. Sometime direct titration of an analyte with a reagent is not FEASIBLE.
What is the difference between titration and back titration?
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.
What is back and black titration?
In a back titration, titrants react directly with the analyte. In a direct titration, titrants react directly with the analyte. In a back titration, a known excess of reagent that reacts with the analyte is used. The excess is then measured with a second titrant.
What is back titration in pharmaceutical analysis?
It includes the process of reacting the analyte with moles of a particular excess reagent and thereby titrating this reagent with a second reagent. Indirect titration is also known as Back Titration.
Why is back titration used?
A back titration is used when the molar concentration of an excess reactant is known, but the need exists to determine the strength or concentration of an analyte. Back titration is typically applied in acid-base titrations: When the acid or (more commonly) base is an insoluble salt (e.g., calcium carbonate)
What is the difference between indirect and back titration?
Indirect titrations are used when, for example, no suitable sensor is available or the reaction is too slow for a practical direct titration. During a back-titration, an exact volume of reagent B is added to the analyte A. Reagent B is usually a common titrant itself.
What is difference between Iodometry and Iodimetry?
Iodometry is the quantitative analysis of a solution of an oxidizing agent by adding an iodide that reacts to form iodine whereas iodimetry is a volumetric analysis involving either titration with a standardized solution of iodine.
What are the 4 types of titration?
Types of Titration
Acid-base Titrations.Redox Titrations.Precipitation Titrations.Complexometric Titrations.
How is back titration used in real life?
For instance, a food processing company might use titration to calculate the precise amount of salt in a particular foodstuff. It can also be used to determine the concentration of vitamin C or vitamin E additives in foods.
Why is back titration used in aspirin?
Using titration it would be difficult to identify the end point because aspirin is a weak acid and reactions may proceed slowly. Using back titration the end-point is more easily recognised in this reaction, as it is a reaction between a strong base and a strong acid.
What is back titration in complexometric titration?
In a back titration an excess of titrant is added to the sample. After a sufficiently long waiting time, this excess is then titrated with a second titrant. The difference between the added amount of the first and second titrant then gives the equivalent amount of the analyte.
What is forward titration?
Forward Titration:
The forward titration follows Standard Methods for the Examination of Water and Wastewater (SM) 4500-Cl D. In this method the chlorine is in the sample at the beginning of the titration which is at a higher µA reading. As the titration runs the chlorine is consumed by the Phenylarsine Oxide (PAO).
What is the importance of titrimetric analysis in pharmaceutical industries?
In medicine, titration is a method of limiting the possible adverse reactions of the body to drugs. This is important because everyone responds differently to pharmaceutical drugs, depending on their age, comorbidity, weight, allergies, immunity, and general biochemistry.
What do you mean by Iodometry?
iodometry. / (ˌaɪəˈdɒmɪtrɪ) / noun. chem a procedure used in volumetric analysis for determining the quantity of substance present that contains, liberates, or reacts with iodine.
What is Volhard method of analysis?
The volhard method is an indirect or back titration method in which an excess of a standard solution of silver nitrate is added to a chloride containing sample solution. The excess silver is then back titrated using a standardized solution of potassium or ammonium thiocyanate with ferric ion as an indicator.
