Biochemistry Research International / 2015 / Article / Tab 5

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 5

Allamanda extracts (methanol extract) (initial colour of extract, brown).

Solvent +Extract =Colour change

ACID
 H2SO4 +ExtractGolden brown
 CH3COOH+ExtractGolden brown
BASE
 NaOH +ExtractYellow
 KOH +ExtractYellow

pH = 5.45.