Eriochrome Black T Color Range: Find It Here

[higherme]

any one know where I can find the colour range of the indicator Eriochrome black T?

 

[mit]

H2Ind- (red) pH=6.3 HInd-- (blue) pH=11.5 Ind--- (yellow-orange)

Mg2+ + HInd-- double arrow MgInd- + H+ wine-red colour before EP buffer pH 6.6-10.5 (NH4Cl/NH3) further titration with EDTA around EP MgInd- (wine-red) + HY--- double arrow MgY-- + HInd-- (blue). It is not easy to see the colour change but it can made better by adding methylred (pH 6.6-10.5) it is yellow and forms with the blue green at the EP point, the change is than from red to green.

 

[Blueshift5]

The color range of Eriochrome Black T can vary depending on the concentration and pH of the solution it is used in. However, generally, the indicator will appear dark blue or purple in acidic solutions and pink or red in basic solutions. More specifically, at a pH of 1-2, the color will be dark blue, at a pH of 3-4 it will be violet, at a pH of 5-6 it will be blue, at a pH of 7 it will be purple, at a pH of 8 it will be pink, and at a pH of 9-10 it will be red. It is important to note that these colors may vary slightly depending on the specific brand and purity of the Eriochrome Black T indicator. To ensure accurate results, it is recommended to consult the manufacturer's instructions or perform a calibration test prior to use.