PEMANFAATAN EKSTRAK DAUN SAMBANG GETIH (Hemigraphis Colorata. Hall. F) SEBAGAI INDIKATOR ASAM BASA

Hemigraphis Colorata. Hall. F leaves are plants that have a distinctive and unique color, namely the upper surface of the leaf is green and the bottom is burgundy. Hemigraphis colorata Hall. F leaves contain anthocyanin compounds. Anthocyanin is the color pigment in plants that can be used for natural indicators. This study aims to examine whether hemigraphis colorata Hall. F leaves can be used as an acid-base indicator to, determine the type of acid-base titration that is suitable for indicators of hemigraphis colorata Hall. F leaves, and to find out what the pH-changing color route of hemigraphis colorata Hall. F leaves is. The method used was extraction, namely maceration. Leaves are macerated by using methanol as a solvent. The extract was previously tested using HCl solution and NaOH solution as a test to prove the presence of anthocyanin. The results obtained in this study, hemigraphis colorata Hall. F leaf extract can be used as an indicator of acid base, and also the type of acid-base titration that is suitable as indicator of hemigraphis colorata Hall.F leaf extract extract precisely on the titration of strong-base strong acid, and strong weak base-acid It is best used as a substitute for the phenolphthalein indicator. In titration of strong and weak acids and bases, it is good to be used as a substitute for the indicator of methyl orange. The pH range obtained from the hemigraphis colorata Hall. F leaf extract is pH 4-7 (red-purple).