What is a limitation of Bromothymol Blue?

Answer 1

Bromothymol Blue is a liquid indicator that can detect presence CO2 in water. It changes color from blue to green, as it detects the presence of the CO2 . In very acidic conditions it will turn yellow. It has also been used as an indicator in the NCO (isocyanate) test (where di-n-butylamine is the base and 1N HCl solution is the acid. Green is the endpoint in this titration and yellow is "over-shot". The amine value test in resin chemistry/synthesis also may use this indicator. HCl directly titrates an amine containing resin.

Answer 2

The Bromothymol Blue is a very useful acid-base indicator. However, it cannot be used to know the exact pH of a solution.

This indicator is a true yellow under 6.0 pH and is blue over 7.6 pH. Because of this, if you have a solution pH=1 and a solution of pH =5 will show the same color, yellow, even though the first solution is 10000 times more acidic.( the pH scale is a logarithmic scale)

Also, this indicator can be used to check if a solution is neutral since it has a greenish color when close to pH=7. However, there is an uncertainty in that value, so you can't know if it is truly neutral.

Answer 3

Bromothymol blue is used as pH indicator: under pH=6 is yellow and above pH=7,6 is blue.

For other applications see the link below.

Answer 4

this is an indicator.

Answer 5

Bromothymol blue will change at ~pH7.

Answer 6

blue pee