Color Change Chemistry 2
The last time I did a similar experiment (Color Change Chemistry) like this one and I used phenolphthalein. But this time I’ll use this special chemical called Bromothymol Blue (BTB). Let’s play around with this chemical.
Things you”ll need: Bromothymol Blue (BTB), 2 test tubes, vinegar, spoon, water (lower than 7 PH), borax, and a beaker.
- Pour vinegar into one test tube, then pour water and borax (use a lot of borax) to the second test tube. Then drop 3-5 drops of Bromothymol Blue (BTB).
- The first test tube turns yellow and the second turns blue (we already learned that on my first post).
- Pour both of the test tubes, at the same time, into the beaker. The liquid will turn green. Make sure your water is lower than 7 PH.
- Pour halves into both test tubes.
- Pour vinegar into the first test tube until it turns yellow.
- Pour water with borax into the second test tube until it turns blue.
- Now you have the same colors when you started.
Bromothymol blue (also known as bromothymol sulfone phthalein and BTB) is a pH indicator. It is mostly used in applications that require measuring substances that would have a relatively neutral pH (near 7). A common use is for measuring the presence of carbonic acid in a liquid. It is typically sold in solid form as the sodium salt of the acid indicator. Bromothymol blue is sparingly soluble in oil, but soluble in water, ether, and aqueous solutions of alkalis. It is less soluble in nonpolar solvents such as benzene, toluene, and xylene, and practically insoluble in petroleum ether.