Why do universal indicators in titration have to be swirled?


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> Why do universal indicators in titration have to be swirled? 
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Here's a specific example: I am using methyl orange along with hydrochloric acid to test the alkalinity of a set of household cleaners (titration), and I have to constantly swirl the conical flask with the cleaner inside, but why? 




Diffusion isn't fast enough, so you're trying to make sure that you're making the pH of the solution as uniform as possible. You can't want a pocket of acidity or basicity to throw you off from the equivalence point.


People also use stir bars to do this if they don't want to swirl all day long.


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