AbstrakPenelitian ini bertujuan untuk mengetahui proporsi asam sitrat dan bubuk jeruk baby java yang tepat untuk menghasilkan tablet effervescent dengan karakteristik fisik, kimia organoleptik terbaik. Rancangan percobaan yang digunakan berupa Rancangan Acak Kelompok (RAK), terdiri dari proporsi asam sitrat (5%, 10%, 15%, 20%, 25%) dengan bubuk jeruk baby java (40%, 35%, 30%, 25%, 20%). Hasil penelitian diperoleh perlakuan terbaik dari analisa fisik, kimia dan organoleptik yakni proporsi asam sitrat 5% dengan bubuk jeruk baby java 40%. Hasil analisis fisik perlakuan terbaik meliputi kekerasan 5,4 N; dan kecepatan larut 1,30 menit. Karakteristik kimia kadar air 0,4719%; pH 8,23; vitamin C 266,46 mg/100g. Karakteristik organoleptik terbaik yakni kenampakan 4,76; rasa 3,35; aroma 3,7.Kata kunci: asam sitrat, baby java, effervescent, jeruk, vitamin C AbstractThis research aims to understand the optimal proportion of citric acid and baby java orange powder to produce effervescent tablets with the best characteristics of physical, chemical and organoleptic. This research used randomized block design (RBD), consists of a proportion of citric acid (5%, 10%, 15%, 20%, 25%) with baby java orange powder (40%, 35%, 30%, 25%, 20%). The best treatment result were obtained from physical, chemical and organoleptic analysis, the proportion of 5% citric acid with baby java orange powder 40%. The results of the best treatment which is hardness 5.4 N; soluble speed 1,30 minute; water content 0.4719%; pH 8.23; vitamin C 266,46mg / 100g. The best organoleptic result that the appearance of 4.76; taste 3.35; flavor 3.7.Keywords: baby java, citric acid, effervescent, orange, vitamin C