Asked by grace

what is observeed when carbon dioxide was bubbled into bromothymol blue?

a. the color of the solution changed from greenish to yellow color.
b. the solution turned cloudy
c. the color of the solution changed from yellow to colorless
d. a precipitate formed

again I say the answer is a. but the color wasn't really greenish it was a more blue color to start then turned yellow is this what i should have observed?
Answered by bobpursley
When CO2 is bubbled into water, a weakish acid (H2CO3) is formed. Water itself is normally neutral, and adding bromothymol blue makes the acid slightly acid. If the water pH was alkaline, the initial color would have been blue, and turned to yellow as CO2 is bubbled.
See the bromo chart and pH.
http://antoine.frostburg.edu/chem/senese/101/acidbase/indicators.shtml
Answered by grace
so then the best answer is a like I suspected.. but you agree it would have been bluish and then turning yellow not so much greenish?
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