Why do you add vinegar to poached eggs?

Online Answer
One is to make the solution (the water) more acidic—and vinegar, which is quite an acidic entity, can do just that. So by adding vinegar, we get a double effect of heating, combined with increased acidity to help the egg white coagulate and form a solid white..
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Do not add salt, as this will toughen the egg. The best vinegar to use is a distilled clear vinegar. ... Once they are all in (don't poach more than 4 eggs at a time or they reduce the water temperature too much), cover with a lid and leave undisturbed for 3 minutes.