Question

What do you understand by iodimetry? How does it differ from iodometry? Why do we use starch

indicator in iodometric or iodimetric titrations when iodine solutions are already coloured? Write

the reactions involved in a typical iodimetric titration.​

Answer 1

Answer:

Note that iodometry involves indirect titration of iodine liberated by reaction with the analyte, whereas iodimetry involves direct titration using iodine as the titrant. ... In an iodometric titration, a starch solution is used as an indicator since it can absorb the I2 that is released.

Answer 2

A)Note that iodometry involves indirect titration of iodine liberated by reaction with the analyte, whereas iodimetry involves direct titration using iodine as the titrant. ... In an iodometric titration, a starch solution is used as an indicator since it can absorb the ½ that is released.

B)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. Likewise the end point in iodometry corresponds to a sudden loss of blue color due to the complex.

C)The iodometric titration is a general method to determine the concentration of an oxidising agent in solution. ... This absorption will cause the solution to change its colour from deep blue to light yellow when titrated with standardised thiosulfate solution. This indicates the end point of the titration