Converting between concentration, moles and volume
Many chemical reactions, including the vast majority of those that happen in the human body, occur in solution. Concentration is used to describe the composition of a solution. The concentration is the amount of stuff that is present. A highly concentrated solution contains a great deal of stuff and a very dilute solution contains very little! Their properties will be very different.
The concentration is defined as the amount of solute dissolved in a particular volume of the solvent.
molarity. Concentration is indicated using square brackets around the substance to which it refers to. It has units of mol L-1 or M. (Try not to confuse the molarity unit "M" with the symbol for molar mass "M" - italics are used to symbols and are not used to units.) When performing any calculations in science, an appreciation of the accuracy and significance of the measurements is vital - just ask an athlete under suspicion of taking performance enhancing drugs. If you are unfamilar with the proper way to handle signficant figures, read the iChem online tutorial (identical to the E9 week 4 pre-laboratory information)
Dealing with concentrations is very important and you will do so many times. There are three possible scenarios:
You know the amount of the substance and the volume of the solution and want to work out the concentration
You know the volume of the solution and the concentration and want to work out the number of moles it contains
You know the amount of the concentration and the number of moles and want to work out the volume required