Biochemistry Research International / 2015 / Article / Tab 3

Research Article

Comparative Analysis of the Properties of Acid-Base Indicator of Rose (Rosa setigera), Allamanda (Allamanda cathartica), and Hibiscus (Hibiscus rosa-sinensis) Flowers

Table 3

Hibiscus extracts (methanol extract) (initial colour of extract: blood red).

Solvent +Extract=Colour change

ACID
 H2SO4 +ExtractPink
 CH3COOH+ExtractPink
BASE
 NaOH +ExtractPale yellow
 KOH +ExtractPale yellow

pH = 6.52.