Journal of Chemistry

Study to Find Out Suitability of Water Extract of Catharanthus Roseus Flowers as Indicator for Acid-Base Titrations

Author:
MAYUR C. SHAH*a, GUNJAN K. SAKHIYAa and PRATEEK G. SHILPKARb
Affiliation:

aDepartment of Microbiology, Gujarat Vidyapith Sadra Dist-Gandhinagar Gujarat India

bBiogas Research and Extension Centre, Gujarat Vidyapith Sadra Dist-Gandhinagar Gujarat India

cAssistant Professor Biogas Research and Extension Centre Gujarat Vidyapith Sadra Dist-Gandhinagar Gujarat India

Email:- mayurchemistry@yahoo.co.in

 

Keyword:
Issue Date:
December 2014
Abstract:

A laboratory experiment was conducted to find out the suitability of water extract of Catharanthus roseus flowers as indicator in different acid-base titrations viz strong acid v/s strong base (0.01, 0.1 and 1M HCl with same concentration of NaOH); weak acid v/s strong base (0.1M CH3COOH with 0.1M NaOH); and weak base v/s strong acid (0.1M NH4OH with 0.1M HCl). The water extract was obtained by simple boiling of 10%w/v solution of Catharanthus roseus flowers in distilled water. The color change of water extract of flower at different pH values was find out pH metrically and for standardization it was compared with phenolphthalein (1% w/v in ethanol) and methyl orange (1% w/v in ethanol) for the same system. The theoretical values of pH at various stages were compared with pH change of natural indicator in this range. Results reveal that the water extract of Catharanthus roseus flowers shows the color change at the equivalence point for HClNaOH and NH4OHHCl titration but it failed to produce color change at equivalence point for CH3COOHNaOH titration.

Pages:
141-144
ISSN:
2319-8036 (Online) - 0973-3450 (Print)
Source:
DOI:
juc

Copy the following to cite this article:

MAYUR C. SHAH*a, GUNJAN K. SAKHIYAa and PRATEEK G. SHILPKARb, "Study to Find Out Suitability of Water Extract of Catharanthus Roseus Flowers as Indicator for Acid-Base Titrations", Journal of Ultra Chemistry, Volume 10, Issue 3, Page Number 141-144, 2016

Copy the following to cite this URL:

MAYUR C. SHAH*a, GUNJAN K. SAKHIYAa and PRATEEK G. SHILPKARb, "Study to Find Out Suitability of Water Extract of Catharanthus Roseus Flowers as Indicator for Acid-Base Titrations", Journal of Ultra Chemistry, Volume 10, Issue 3, Page Number 141-144, 2016

Available from: http://www.journalofchemistry.org/paper/312/

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