Shown below is the structure of bromocresol green as it exists in acidic media S

Question

Shown below is the structure of bromocresol green as it exists in acidic media

Shown below is the structure of bromocresol green as it exists in acidic media' bromocresol green is yellow or blue depending on the pH of the solution it is in. a. Is the structure above responsible for the blue or yellow color? Explain. (4 points) b. Which proton is the most acidic in the molecule? Circle it in the structure and justify your answer. How does this proton compare to phenolphthalein in terms of acidity?

Explanation / Answer

a.this structure is responsible for yellow color. bromocresol in aqueous solution deprotanates to give the above structure in low pH

b. the acidic proton is the one that cleaved first from this SO3 in this structure .

c. this is more acidic than phenolphthalein

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