It’s #NationalNachosDay! They’re often served with a smooth cheese dip—made by adding (tri)sodium citrate, or Na₃C₆H₅O₇, to cheese. It reduces the pH, makes the cheese proteins more soluble & prevents the mix separating.

Ignoring the numbers, its formula spells… 😄 #272sci

(Note for new followers: the hashtag #272sci came about because these small, sciency tweets are written to fit into Twitter’s 280 character count – 272 characters with the tag and a space.)