The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamine tetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes from

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blue-green to reddish brown

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blue to colourless

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reddish brown to pinkish yellow

TuteeHUB · Answer

wine red to blue

1.	The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamine tetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes from
A.	blue to colourless
B.	reddish brown to pinkish yellow
C.	wine red to blue
D.	blue-green to reddish brown
Answer» D. blue-green to reddish brown

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