Ari, Widayanti dan Naniek Setiadi, Rajab dan Dwi, Oktarini Optimization of The Concentration of Citric Acid and Tartaric Acid (1:2) as The Acid Source Reviewed of The Physical Properties of Noni Juice Effervescent Granules. Optimization of The Concentration of Citric Acid and Tartaric Acid (1:2) as The Acid Source Reviewed of The Physical Properties of Noni Juice Effervescent Granules.