Rubbing alcohol is diluted isopropanol. The formula for isopropanol is (CH3)2CHOH or simply C3H8O.
The pH of hydrogen peroxide at concentrations of 10% to 12% is around 3.0 to 4.0. It is considered acidic.
BTB (bromothymol blue) is a pH indicator that turns yellow in acidic conditions (pH < 6) and blue in basic conditions (pH > 7.6). Rubbing alcohol is typically neutral in pH (around 7), so when mixed with BTB, the color would likely remain green due to the pH of rubbing alcohol not significantly affecting the indicator.
pH scale.
The neutral pH is 7,00.
The highest number on the pH scale is 14. The pH scale goes from 0 to 14.