What does it look like?
What is it?
Yes at Crystallography365 towers pancake day came and went and we didn’t notice (or have any pancakes). But it’s probably time we blogged about another foodstuff and today it’s the turn of citric acid. Normally a white powder, citric acid can form as an anhydrous (without water) form – which is what we’ve pictured, and a monohydrate (along with one water atom. It can be grow into lovely crystals that look beautiful under polarised light.
Where did the structure come from?
We got the co-ordinates for this the arrangement of citric acid molecules from a paper by Nordman, Weldon and Patterson published in 1960.