2.1.1 prepare a stock solution of gallic acid slurry concentration 10 mg/mL, 10 mL volume by weighing the gallic acid 100 mg dissolved in distilled water and adjust the volume to 10 mL with a 2.3.1.2 water slurry preparation standard 10 gallic acid concentration 0.08 0.06 0.04 0.02, 0.10, and mg/mL, volumetric pipette, 5 mL standard solution by gallic acid 10 mg/mL concentration in volume 10, 20, 30, 40 and 50 µL and adjust the volume with distilled water, 5 mL.
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