Science Posters

Okay, thought I'd dig these out of the digital attic. The following are links to two science posters I made some time ago.
They are licenced under Creative Commons (Attribution and Share Alike) so feel free to print share.

Pearson's Square - Or Why Didn't My Chemistry Lecturers Teach Me This?

A common problem in chemistry (and feedlots, and home distilling, etc),

You have two solutions of different concentrations, let's call them H (high concentration) and L (low concentration), and you want to mix them to create a solution of concentration F (final concentration).

Using algebra, it takes a bit of time to get this.
xH + (1-x)L = C, etc, etc, etc, solve for x.

Using the Pearson's Square, it goes like this:

H - F = parts of solution L
F - L = parts of solution H

Gaaahhh.

Videos for Chemistry Laboratory Techniques

The following link points to a series of videos showing chemistry laboratory techniques, such as recrystallization  melting point determination, thin-layer-chromatography and titration.

http://ocw.mit.edu/resources/res-5-0001-digital-lab-techniques-manual-spring-2007/videos/

Iodine Clock Reaction Kinetics

The following is a quick description of a reaction I developed and refined over the period of three years. It is an adaptation of this experiment.
The Berocca makes it quicker to accurately prepare solutions of Vitamin C, and the distilled water removes any variability from the hardness of the tap water.