Which among the indicators can be used in complexometric titration using EDTA?
Indicators. Calmagite and Eriochrome BlackT (EBT) are such indicators that change from blue to pink when they complex with calcium or magnesium. The endpoint of a complexometric EDTA titration using either Calmagite or EBT as the indicator is detected as the colour changes from pink to blue.
Which indicator is used in EDTA method for determination of hardness?
Eriochrome Black-T
The total hardness of water is estimated by titrating the water sample against EDTA using Eriochrome Black-T (EBT) indicator.
What type of indicator is EBT?
Eriochrome Black T is a complexometric indicator that is used in complexometric titrations, e.g. in the water hardness determination process. It is an azo dye. Eriochrome is a trademark of Huntsman Petrochemical, LLC. In its deprotonated form, Eriochrome Black T is blue.
What is the indicator used in EDTA method Mcq?
Explanation: The indicator used in the EDTA method is erichrome black T.
Why is phenolphthalein not a suitable indicator for titration involving carbonates?
Because (as the names suggest) the equivalence point of a titration will result in an acid salt. The greater acidity of the acid overcomes the basicity of the base. Thus it will occur at a pH less than 7. Phenolphthalein is colorless at this neutralization point, and will go colorless at pH 8 before you reach the end.
Is phenolphthalein the best indicator for this experiment?
– Other indicators like methyl orange change its colour at around a \[pH\]of 4. So, there is a considerable difference between the \[pH\]of the colour change of the indicator and the equivalence point for the titration of the weak acid and strong base. – So, phenolphthalein is the best indicator in this case.
Which indicator is used for hardness determination titration?
Eriochrome Black T
Eriochrome Black T is a complexometric indicator that is used in complexometric titrations, e.g. in the water hardness determination process. It is an azo dye.