Question

Why is murexite preffer over eriochrome black tin the estimation of nickel using edta?

Answer 1

Murexide is preferred because of its loose binding with nickel ions

Explanation:

Murexide and eriochrome Black T are the indicators used in EDTA titration. Usually in the titration of EDTA eriochrome black t is used as indicator. But in in the estimation of nickel using EDTA murexide is used as indicator. It is because murexide will not bind strongly with the nickel ions than the binding of EDTA. Hence the metal-indicator bond can be broken easily to form metal-EDTA bond. So murexide is preferred and it has different colour when it is free and when it is binded with nickel ions. Hence it can be indicated easily.

Answer 2

Murexide is a suitable indicator and is used over eriochrome black tin the estimation of nickel using edta.

Definition of Murexide:

Murexide also called as ammonium purpurate or MX. It dissolves in water with the the purple color. Murexide works as a indicator reagent as well.

Uses of Murexide;

• It is found as the complexometric function for the complexometric determination.
• Murexide is used for calcium ions but also for copper, nickel, cobalt, thorium, and rare-earth metals.
• It has been referred  as eclipsed by calcium-ion selective electrodes.

Preference of Murexide;

• Nickel is titrated with EDTA against Murexide. The mixture enhances the color changes at the end point.
• The solution produces the low ammonia concentration and the increasing end point.

Hence, Murexide is a suitable indicator referred as indicator reagent. With the function of complexometric function.