Analytical chemistry is concerned with the measurement of the
chemical compostion of unknown substances using exisitng
instrumental techniques, and the development or application of
new techniques and instruments. Anytime a measurement is made
with an instrument, there is an error, a deviation from the true
value, ineherent in that measurement. Instrumental analysis is
very important in all areas of analytical chemistry. Modern
analytical chemistry is a quantitative science, meaning that the
desired result is almost always numeric. We need to know there
is 55 μg of mercury in a sample of water, or 20 mM glucose in a
blood sample. Quantitative results for analytical chemistry are
obtained using devices or instruments that allow us to determine
the concentration of a chemical in a sample from an observable
signal. One of the most important techniques is analytical
chemistry is the preparation of the calibration curve, which is
an equation relating a signal measured from an instrument to the
concentration of a s