This experiment aimed to determine the factors influencing the effectiveness of the enzyme Catecholase. The study involved two phases: varying enzyme concentrations and different pH levels. In the first phase, six samples were analyzed using a spectrophotometer, with two blanks and four containing Catecholase in concentrations ranging from 0.5 ml to 1.75 ml. Data indicated a positive correlation between enzyme concentration and absorption rates, suggesting higher enzyme activity at increased concentrations. In the second phase, four samples containing a constant amount of Catecholase were tested at pH levels of 4, 5, 6, and 8. Results demonstrated that enzyme activity was highest in a pH range of 6 to 8. These findings provide evidence that Catecholase functions optimally at neutral to slightly alkaline pH levels and in higher concentrations. This study contributes to the broader understanding of enzymatic activity, highlighting the importance of maintaining appropriate enzyme concentrations and pH conditions to achieve maximum efficiency. Such insights are crucial for various applications in biochemical research and industrial processes where enzyme performance is critical.