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It acts as an indicator so it changes color
The color of the bromthymol blue solution or blue btb is yellow after you exhaled into it..:)
when starch indicator is added, the solution turns from dark blue-black to colourless.
According to our experiment, CO2 was released to the BTB, it became like color yellow-green.
the colour of the indicator will increase
At a particular point, the color of the indicator would change from colorless to pink (purple).
blue
No color change is there...
Red
phenolphthalien when added to an acidic solution has a colourless indicator. but shows pink colour for basic solution.
Blue
The function is to change color. This happens when all the H+ ( or H3O+) from the acid has been neutralized, an indicator in the sample will change