Question

Why starch not used as an indicator in redox titration having high acid concentration?

Answer 1

Answer:

because it not change its colour

Explanation:

because it is having coldrink like substances agdam sagdam

Answer 2

starch not used as an indicator in redox titration having high acid concentration Because

One of the initial scarcely any essential science tests directed is to add iodine to potato cuts and watch it turn blue dark. Iodine is then presented as a pointer for the nearness of starch.  

• In an iodometric titration, the jobs are turned around. Starch is currently utilized as a pointer for the nearness of iodine.  

• Toward the start of the titration, because of the generally high centralization of I2 in the arrangement, the shading seems a profound darker/rosy darker (which is in reality because of the nearness of (I3)- particles which exists in a balance with I2 and I-). As the titration continues, the centralization of I2 in arrangement falls and the shading begins to go to a lighter shade of darker, at that point yellow and afterward extremely light yellow.  

• Toward the end purpose of the titration (where no more I2 is available), the arrangement ought to seem dismal. Be that as it may, the progress from light yellow to dismal isn't exceptionally sharp. At this stage, we include starch which at that point goes about as a pointer of the nearness of I2, the substance of the cup to a dark blue dark shading. The shading change from dark blue dark shading to dreary is sharp and this makes the end point all the more effectively decided.  

• The dark blue dark shading is because of the arrangement of a starch-iodine complex. With respect to why it is included close to the finish of the titration as opposed to toward the start is on the grounds that the starch-iodine complex at high I2 focuses is moderately steady. The arrival of I2 from the starch-iodine complex is delayed at high I2 fixations.  

As we are searching for the release of the blue dark shading, we will wind up including more titrant believing that the end point has not been arrived at when truth be told, the decolourisation would occur if the iodine was offered time to separate.