In
this experiment, the most common problem in analytical chemistry was faced: determining
the quantity of an unknown compound in a given sample. This can be solved by
using instrumental analysis with the only issue remaining being the composition
of the unknown itself and whether or not reminisce of concomitants will shift
the results collected.

            The simplest way to determine the
mass of the unknown compound is to create a calibration curve by using known
standards of the desired unknown compound and conclude the mass of the unknown
compound depending on where on the curve the signals falls. In this case,
standard solutions of riboflavin are prepared (x-value) and their recorded
signals (y-value) were respectively plotted which will give a linear
regression-line following the equation:

We Will Write a Custom Essay Specifically
For You For Only $13.90/page!


order now

 

(Equation 1)

 

where
y is the signal obtained, m is the slope of the line, x is the concentration of
the known compound (riboflavin) and b being the y-intercept of the line. The
concentration of the desired analyte in the unknown compound can be calculated
by plugging in the signal obtained for the y-value and solve for x. A
disadvantage of this method is that the concentration of the unknown mass has
to fall within the linear dynamic range of the standard solutions prepared.

Linear dynamic range is defined as the range of data points where the output
has a linear function to the input. The limited of this range can be defined as
the linear line, these curve tend to deviate and from plateaus with increasing
inputs.

            Multiple standard addition resolves
the same problem as a calibration curve by using the spiking of the desired
sample.

x

Hi!
I'm Ethel!

Would you like to get a custom essay? How about receiving a customized one?

Check it out