Hydrochloric acid ( 75.0 mL, 0.250M ) is added to 225.0mL of 0.050 M barium hydroxide. What is the concentration of excess H or OH-
the answer is 0.8m.
alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.
alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".