Page 28 - Vogel's TEXTBOOK OF QUANTITATIVE CHEMICAL ANALYSIS

A NOTE ON UNlTS AND REAGENT PURITY

SI units have been used throughout this book, but as the 'litre' (L) has been
accepted as a special name for the cubic decimetre (dm3) although this is not
strictly speaking an SI term we have felt that it is appropriate to employ it
throughout this book. Similarly we have chosen to use millilitres (mL) instead
of cubic centimetres (cm3).
Concentrations of solutions are usually expressed in terms of moles per litre:
a molar solution (M) has one mole of solute per L.
It should also be emphasised that unless otherwise stated al1 reagents
employed in the analytical procedures should be of appropriate 'analytical
grade' or 'spectrosçopic grade' materials. Similarly, where solutions are prepared
in water this automaîically means 'distilled' or 'deionised' water from which
al1 but very minor impurities will have been removed.

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