Why does hot water not make the btb turn color to yellow
Temperature does not make a difference since it test for pH levels. It will only turn yellow if the pH is 6.0 or lower.
Assuming your asking about bromothymol sulfone phthalein.
Hot water does not make the BTB (Bromothymol Blue) turn yellow because BTB is a pH indicator that changes color based on the acidity or alkalinity of a solution. In its natural state, BTB is a blue color. When it comes into contact with an acidic solution, it turns yellow, indicating a low pH. However, hot water does not have an effect on the pH of BTB, therefore it does not cause it to change color.
To understand why hot water does not affect the pH of BTB, we need to know that temperature alone does not alter the pH of a solution. pH is a measure of the concentration of hydrogen ions (H+) in a solution. It is determined by the presence or absence of acidic or alkaline substances in the solution, not by temperature.
If you want to see the BTB change color to yellow, you can add a few drops of a mildly acidic solution, such as lemon juice or vinegar, to the mixture of hot water and BTB. The acidic substances will lower the pH of the solution, causing the BTB to change from blue to yellow.