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Chemistry In Pictures

Chemistry in Pictures: Stirred solid

by Manny I. Fox Morone
May 24, 2023


A solid beige-colored disk with a swirl in its middle sitting in the bottom of a round-bottom flask.

One of the last reactions David Mason ran while working on his PhD ended up unlike any other he’s ever run. While the reaction was still stirring, he let the flask cool to room temperature, and when he came to check on it, the swirl of the reaction solution had solidified mid-stir. Mason, who recently completed his PhD work in the lab of Eugene Mash at the University of Arizona, was running a Krapcho decarboxylation that involved a lot of lithium chloride. He thinks that the concentration of the LiCl was so high that it crashed out of solution all at once as the temperature of the flask dropped, but he notes that this didn’t happen for any other Krapcho decarboxylation he ran.

A solid beige-colored swirl that looks like it is made out of dough viewed through the neck of a round-bottomed flask.
Credit: David Mason

Submitted by David Mason

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