Question

Based on the formula below, what quantities of each are needed to make 180 mL of this lotion?
Benzyl Benzoate 250 mL
Triethanolamine 5 mL
Oleic Acid 20 mL
Purified water to make 1000 mL
a. 78 mL, 2 mL, 5.8 mL
b. 50 mL, 1 mL, 4.5 mL
c. 45 mL, 0.9 mL, and 3.6 mL

Answer 1

Scale factor = 180/1000 = 0.18.

Benzyl benzoate: 250 × 0.18 = 45 mL
Triethanolamine: 5 × 0.18 = 0.9 mL
Oleic acid: 20 × 0.18 = 3.6 mL

So answer c. (Add purified water to bring total to 180 mL — 180 − (45+0.9+3.6) = 130.5 mL.)