ABSTRACT
This chapter aims to ensure students are aware of the differences between volumes, amounts and concentrations and introduces the concept of significant figures. It shows that students are aware of the most common methods of measuring concentration and to introduce molarity. Some chemicals, for example methanol, are not usually solid and although students could weigh out an amount in grams it would be easier to measure out the amount wanted by volume. Concentration refers to an amount in a given volume and can be measured against a number of standards. Concentrations may be given as percentage weight/volume or percentage volume/volume. Concentration and accuracy are areas which seem to cause difficulty to many students, yet these are probably the most commonly used concepts in the laboratory. Many students are uncomfortable with concentrations because these concepts are crucial in many scientific fields.
