The given apparatus shows the
simple distillation of a table salt solution. In which part of the apparatus is
salt collected at the end of the experiment? (A) The distilling flask, (B) the
glass beaker, (C) the condenser, (D) the conical flask.
Simple distillation is a type of
distillation in which the most volatile component is separated from the mixture by
heating and then condensing and collecting the vapor. In this problem, the mixture being
separated is a table salt solution. The solution is composed of sodium
chloride dissolved in water. The boiling point of liquid water
is substantially lower than that of sodium chloride. Therefore, water is the most
volatile component in the mixture and will boil first.
At the beginning of the experiment,
the table salt solution is found in the distilling flask. The solution is heated using a
Bunsen burner. And when a temperature of 100
degrees Celsius is reached, the water in the mixture boils and turns into a
vapor. As heating continues, the water
vapor rises up and out of the flask until it reaches the condenser, at which point
the water vapor is cooled and converted into liquid water. The liquid water is then collected
in a conical flask. The distillation will be complete
when all of the water in the distilling flask has been boiled away, condensed, and
collected in the conical flask. Pure solid sodium chloride salt
will be left behind in the distilling flask.
So, in which part of the apparatus
is salt collected at the end of the experiment? The answer is the distilling flask,
or answer choice (A).