Biochemistry Research International / 2015 / Article / Tab 2

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 2

Hibiscus extract (cold extract) (initial colour of extract, blood red).

Solvent+Extract=Colour change

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

pH = 5.24.