Biochemistry Research International / 2015 / Article / Tab 4

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 4

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

Solvent +Extract =Colour change

ACID
 H2SO4 +ExtractBrown
 CH3COOH+ExtractBrown
BASE
 NaOH +ExtractYellow
 KOH +ExtractYellow

pH = 5.35.