h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Sorry about the double post there.

I have to say I actually support the A level stance there I'm afraid because you *must* get used to doing your calculations in mol dm-3. Besides this makes teaching and assessment much easier along with reducing confustion amongst the students

Use of other concentration terms is pretty much restricted to the use of solutions of approximate concentration for non-quantitative uses such as a wash solvent in a reaction work up or a quench to stop a reaction. Here no accuracy is needed whereas for a titration for example you need accurate molarities where you certainly will work in mol dm-3.

I quite agree about using S.I. units, they seem to be a lot more starightforward, and after using them for two years at A-Level, it was a bit confusing to adapt to different units (although it all made sense once you juggled them around a bit). But oh how we dreaded those long titration questions on the exams!

The only way of "reducing *confustion* amongst the students" is to make sure they take regular baths.

Actually "reducing confustion" was a seminal paper by Hoffmann in 1923 - a landmark paper in Organic chemistry