On the use of

Hibiscus subdariffa flower extract as natural acid-base indicator

Yakasai I. A., Musa H., Hamisu I., Sagagi B. S., Usman M. I.

Abstract


The use of

Hibiscus subdariffa flower extract as a naturally occurring acid-base indicator was studied. This flower contains anthocyanine pigment whose colour depends on pH. The acid-base equilibrium of this pigment was investigated using spectrophotometric method. The pkIn values were found to be 2.8 and 7.3. The use of this extract in acid-base titration gave similar result(s) compared to methyl orange indicator.


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