How does iodometric titration work?
Note that iodometry involves indirect titration of iodine liberated by reaction with the analyte, whereas iodimetry involves direct titration using iodine as the titrant. This absorption will cause the solution to change its colour from deep blue to light yellow when titrated with standardised thiosulfate solution.
Which indicator is used in iodometric titration?
starch
The indicator that is usually chosen for titrations involving iodine (triiodide) is starch. Starch forms a dark blue complex with iodine. The end point in iodimetry corresponds to a sudden color change to blue.
What is difference between iodometric and Iodimetric titration?
Iodimetric titrations: When an analyte (a reducing agent) is titrated directly with a standard iodine solution, the method is known as iodimetry….Complete answer:
| Iodometric Titrations | Iodimetric Titrations |
|---|---|
| It is used to quantify oxidizing agents. | It is used to quantify reducing agents. |
How do you titrate copper?
Copper(II) ions react with excess iodide ions to form a precipitate of copper(I} iodide and molecular iodine. You can titrate the iodine against a standard solution of sodium thiosulfate, using starch indicator. The copper(II) ions can also be titrated against a solution of EDTA in a complexiometric titration.
What is the basic 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.
Why Ki is used in iodometric titration?
KI, or potassium iodide, is used in iodometric titration because the iodide will be oxidized to iodine in the presence of an oxidizing agent.
Why starch is used in iodometric titration?
The Starch-Iodide complex is not very soluble in water, so the starch is added near the endpoint of an Iodine titration, when the Iodine concentration is low. This eliminates errors due to the fact that some Iodine may remain adsorbed on the complex and go undetected.
Why excess KI solution is used in iodometric titration?
In an iodometric titration, a starch solution is used as an indicator since itcan absorb the I2 that is released. This absorption will cause the solution to change its colour from light yellow to a dark blue colour when titrated with standardised thiosulfate solution. This indicates the end point of the titration.
What are the apparatus used in titration?
Acid-base titrations are used to determine the concentration of a sample of acid or base and are carried out using a piece of equipment called a burette. It is a long, glass tube with a tap at the end which can be used to very carefully add drops of liquid to a test solution.