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Undergraduate Education

Chemistry in Pictures: Alchemy or intro chem?

by Craig Bettenhausen
August 21, 2019
Advertisement

Most Popular in Education

A wooden rack of test tubes with a gold liquid in the tube, with sunlight showing through all of the tubes.
Credit: Gregory J. Rummo

In an experiment that Gregory J. Rummo teaches his general chemistry students, the students make six solutions of known concentrations of Fe(NCS)2+, aka isothiocyanatoiron (III), in dilute nitric acid. Students then measure how much light at 447 nm that each solution absorbs to understand the reaction between the iron and the thiocyanate.

But on this particular day, this set of samples was at just the right angle to catch the light so that the normally red-orange solutions looked like gold.

Credit: Gregory J. Rummo, @GregRummo on Twitter

Do science. Take pictures. Win money. Enter our photo contest here.

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Chemical & Engineering News
ISSN 0009-2347
Copyright © 2024 American Chemical Society

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