The Student Room Group

Activation Energy problem

i'm doing an experiment to determine activation energy for reaction between Bromine and Bromide... by mixing a boiling tube of phenol+bromide+methyl red and a boiling tube of sulphuric acid at diff temperatures~

and there's a question: Wt function does the methyl red play in this experiment? (Hint: it is not acting as an indicator in the accepted sense.)

i donno the ans of this one >.< plz help~
is it the clock reaction?

phenol is the clock
when all the clock has reacted with the bromine produced, the excess bromine will bleach the methyl red so you can tell the endpoint
Reply 2
o.... THX ^^

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