Topic > Ottomed vials were obtained and labeled one to three. 3 ml of hydrogen peroxide was dispensed to each vial. A drop of liquid soap was then added to each vial. The contents of the vials were gently swirled to ensure mixing of the hydrogen peroxide and soap. A pH buffer was added to each vial; vial one received pH 2 buffer, vial two received pH 7 buffer, and vial three received pH 12 buffer. 1 ml of catalase was then placed in each vial and the reaction was timed for 2 minutes . At the end of the two minutes, the column of bubbles produced was measured and recorded in Table 3. The results were then graphed, as shown in Figure