ABSTRACT
Samples
of Pride of Barbados flower were extracted and analysed for its indicator
properties in acid-base titration. Acetone, ethanol and acetone/ethanol
mixtures were used for the extraction. The results of the indicator extracts
showed greenish to amber colour in basic medium and pink at the end point for
all the extracts. The results of statistical analysis were compared with that
of the standard indicator (phenolphthalein) for precision. Extracts X showed
calculated FR value (1.0) < the critical FR value
(6.3) for (P = 0.05) and calculated Td (0.4) < critical Td
(1.27) for (p = 0.05). Extract Y gave calculated FR (2.0) <
critical FR (6.3) and calculated Td (0.2) < critical Td
(1.27) and extract Z gave calculated FR (1.0) < critical FR
(6.3) and calculated Td (1.0) < critical Td (1.27)
respectively. In all, the results showed that there is no significant difference
between the extracts X, Y, Z and the standard indicator (phenolphthalein).
Therefore, it is recommended that Pride of Barbados flower extract should be
used for standardization in acid base titration.
