PENGUJIAN INDEKS BIAS DALAM MINYAK JAHE HASIL PENGKELATAN DENGAN ASAM SITRAT MENGGUNAKAN WYA ABBE REFRAKTOMETER (Testing The Refractive Indeks In Ginger Oil With resulting from Chelating Citric Acid Using A WYA ABBE Refractometer)

Abstract

Chelating serves to improve the quality of ginger oil. The method of chelating performed in this study is to use citric acid, where citric acid can be used as a binder of impurities in ginger oil so as to improve the quality of ginger oil. In this case the measurement of the quality of ginger oil is measured by testing its refractive index by placing a refractive index of pure ginger oil with refractive index of ginger oil resulting from citric acid by using the WYA Abbe Refractometer. . In testing the refractive index of ginger oil using citric acid chelating at concentration 0N; 0,5N; 1N; 1,5N; 2N; 2,5N and 3N obtained refractive index of oil equal to 1.4895 1.4915; 1.487; 1.4878; 1.4855; 1.489; and 1.4869. In this experiment, obtained value From the test results of refractive index value of ginger oil 0.5 N concentration rose, 1 N concentration decreased, 1.5 N of contraction rose, 2 N of contraction decreased, 2.5 N of contraction rose, 3 N down. While from the graph in can regression equation y = -0,0005 x + 1,4902 with value R2 = 0,3069. Keywords: Citric Acid, Refractive Index, WYA Abbe Refractometer