In each trial, you will add an indicator to the mystery food sample. But you will also add the
indicator to a known substance and water. Why is
that important? Check all reasons.
to practice measuring volume using the
graduated pipette correctly
to match the mystery food sample to a
definite positive result (gelatin, oil, etc.)
to match the mystery food sample to a
definite negative result (water)
to increase the amount of data.