Acacia bark powder (Acacia crassicarpa) can be used as an adsorbent because it contains cellulose, hemicellulose and lignin which play an active role in the adsorption process. This study aims to determine the contact time, stirring speed and optimum temperature of Rhodamine B dye adsorption by acacia bark powder (Acacia crassicarpa). The method used was adsorption method using batch system. Ad…