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Common solvents and solvent systems are given in Tab. To get a good separation between your product and any impurities and, where possible, to use as little solvent as possible, the key is to test potential solvent systems before setting up your column.

To do this, you will need to run thin layer chromatography (TLC) using glass or aluminium sheets coated with silica (the aluminium sheets are cheaper, so are more common). 3 shows the desired spot barely moves off the baseline while the impurities race ahead.

The book has been developed by Tina Cardone, a Public High School Mathematics teacher in Massachusetts, with the active involvement of the online mathematics community. This chapter from the book ‘Nix the Tricks’ by Tina Cardone looks at tricks and short cuts used in the teaching of operations, explains why they are so damaging, and then provides an alternative method that teaches for understanding.

Topics in this chapter include; using correct terminology for worded problems,...

While correctly packing your column is arguably the most important experimental factor, there remain several other factors that can be optimized to help you achieve the best separation possible in the shortest amount of time.

Here we guide you through how to choose the best solvent system for your sample, and look at how much silica you will need and in which size column.The book has been developed by Tina Cardone, a Public High School Mathematics teacher in Massachusetts, with the active involvement of the online mathematics community.The main audience for the resource is teachers of Key Stage 3 but there is much that will also be of use in each of the other Key Stages.The book is available in its entirety and also for convenience divided into chapters.The preface describes the chain of events that led to the creation of the ‘Nix the Tricks’ project.This chapter from the book ‘Nix the Tricks’ by Tina Cardone looks at tricks and short cuts used in the teaching of proportional reasoning, explains why they are so damaging, and then provides an alternative method that teaches for understanding.

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