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Catfish (Pangasius hypophthalmus) fat is a waste that has not been used optimally, especially in the use of soap. This study aimed to determine the effect of operating conditions are temperature, reaction time, and the ratio of volume between catfish oil and KOH. Soap can be formed by saponification reaction with strong alkali by hydrolyzing catfish oil with variations in the volume ratio of reactants (1:2, 1:3 and 1:4), temperature (75 C and 95 C) and reaction time (45 minutes and 75doi:10.24845/ijfac.v4.i2.77 fatcat:p47c6smek5hvjc53h5yk4323hi