On the use of Hibiscus subdariffa flower extract as natural acid-base indicator

Authors

  • I. A. Yakasai Department of Pharmaceutical and Medicinal Chemistry, A.B.U. Zaria Author
  • H. Musa Department of Pharmaceutical and Medicinal Chemistry, A.B.U. Zaria Author
  • I. Hamisu Department of Chemistry, Ahmadu Bello University, Zaria. Nigeria. Author
  • B. S. Sagagi Science and Technical Schools Board, Kano Author
  • M. I. Usman Audu Bako College of Agriculture, Danbatta, Kano Author

Keywords:

Hibiscus subdariffa , acid-base indicator, local sourcing

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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Published

2025-02-25

Issue

Vol. 2 No. 1 (2005): ChemClass Journal

Section

Articles