Abstract

Ashoke Hazra

DOI : http://dx.doi.org/10.13005/ojc/370534

Present research introduces on the natural indicator (Acid-Base). For this samples were collected from countryside flower petals. These are pink Madhabilata flower, violet Dahlia flower, yellowish red Miralibis Jalapa, light pink Nerium Oleander. With the help of pH meter colour changes were observed using Soxhlet extractor. Cold extract of the flower petals are prepared. For this study we use UV/Visible Spectrophotometer to determine the maximum wave length. The decreasing order of intercept from the above spectroscopic plots that pink Madhabilata> violet Dahlia>redish yellow Miralibis Jalapa> light pink Nerium Oleander. Natural indicators show prominent colour changes in acidic and basic solutions. So, it is easily replaceable to the synthetic indicator which is toxic in nature. These natural indicators are easily available, cheap, environment friendly and also nature friendly.

Absorption; Acid-Base, Dahlia; Madhabilata, Miralibis; Nerium Oleander; Natural Indicator; p^H Wavelength

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