What is purpose of sodium thiosulfate in iodometric titration?
Redox titration using sodium thiosulfate, $N{a_2}{S_2}{O_3}$ (usually) as a reducing agent, is known as iodometric titration because it is used exclusively to use iodine. Iodometric titration is a common method for determining the concentration of oxidizing agents in solution.
Why iodometric titrations are done immediately?
In these cases the titration of the liberated iodine must be completed quickly in order to eliminate undue exposure to the atmosphere since an acid medium constitutes an optimum condition for atmospheric oxidation of the excess iodide ion.
Why HCl is used in iodometric titration?
In iodometric determination of sulfide two reactions are taking place when alkaline solution is added to HCl acid-iodine. To eliminate the side reaction in iodometric titration, the sulfide solution must be acidic when it is mixed with HCl-iodine.
Why iodometric titrations are done in dark?
The reaction mixture should be kept in the dark before titration because light accelerates a side reaction in which iodide ions are oxidized to iodine by atmospheric oxygen.
In which case iodometric method is usually used?
Iodometry is commonly used to analyse the concentration of oxidizing agents in water samples, such as oxygen saturation in ecological studies or active chlorine in swimming pool water analysis.
What is the principle of iodometric titration?
The Basic Principle of iodometric titration is to determine the concentration of an oxidising agent in solution. iodometry involves indirect titration of iodine liberated by reaction with the analyte.In an iodometric titration, a starch solution is used as an indicator since it can absorb the I2 that is released.
What is hypo solution in titration?
Hypo Solution is the abbreviation for sodium thiosulphate or sodium hyposulphite. It is used for both film and photographic paper processing, the sodium thiosulfate is known as a photographic fixer and is often referred to as ‘hypo’, from the original chemical name, hyposulphite of soda.
What is hypo used for?
It is used for both film and photographic paper processing; the sodium thiosulfate is known as a photographic fixer, and is often referred to as ‘hypo’, from the original chemical name, hyposulphite of soda. Ammonium thiosulfate is typically preferred to sodium thiosulfate for this application.
Why do we use hypo solution?
-Hypo solution is used as a dechlorinator for neutralization of the chlorinated water or for lowering of the level of chlorine in the water bodies like swimming pools, buckets, storage tanks, taps, etc. -It is used in laboratories in the iodometric titration where hypo solution is used in standardized form.
What is iodometry and iodimetry titration?
Iodometry is a titration where the iodine produced in the previous redox reaction is titrated with a reducing agent whereas iodimetry is a titration where iodine solution is directly titrated with the reducing agent; Iodometry is an indirect method of analysis whereas iodimetry is a direct method of analysis; Iodometry entails two redox reaction whereas iodimetry entails a single redox reaction
What is a titrant in a titration?
In analytical chemistry, the titrant is a solution of known concentration that is added (titrated) to another solution to determine the concentration of a second chemical species. The titrant may also be called the titrator, the reagent, or the standard solution.
What is iodine titration?
Iodometry, known as iodometric titration, is a method of volumetric chemical analysis, a redox titration where the appearance or disappearance of elementary iodine indicates the end point.