Microscale Laboratory

 

2017 Topic: Vitamin C in Fruit Juices

OBJECTIVE: 

Use microscale techniques to determine the amount of Vitamin C in an unknown fruit juice.

 

Materials Provided by NJIT on the Day of the Event:

  • Sample of Fruit Juice (Unknown)
  • 0.2 - 0.5 g of L-ascorbic acid.


Materials & Methods Brought by Team to the Competition: 

  • Bring whatever you need to perform the experiment but you must use microscale techniques.  Make sure you have enough deionized water.  
  • Burets may not be used as they are not used in microscale procedures.
  • Prior to starting, each team must provide the judges with a typed step-by-step description of the methods they intend to use to address the objective of this experiment.

INSTRUCTORS NOTES ON SPECIAL SAFETY CONSIDERATIONS:  

  • Laboratory should be supervised by instructor/coach at all times.  
  • Review all procedures for safety concerns.  
  • Teams will be permitted to perform their experiment only if their procedure is approved by the judges in accordance with safety protocols.
  • Safety protocol must be addressed in the team's procedure submitted for evaluation prior to event.
  • Teams must practice procedure prior to event day. Judges reserve the right to dismiss unprepared teams the day of the event.


Prior to the event

A step-by-step Description of the Methods and Safety Protocol  must be received by the Director of the NJCO by the deadline indicated in the Requirement Overview. You must practice your procedure.  Judges may disqualify entrants who are not confident about their procedure, and as a result pose a safety risk.  Review, be familiar with and be prepared to follow all safety guidelines associated with your chosen method.

Research appropriate small scale techniques, or microscale techniques. Lab manuals available from various scientific suppliers including Flinn Scientific, Inc. Furthermore, publications such as the Journal of Chemical Education may serve as sources for specific Microscale techniques.


On the Day of the event:   

  • Follow team's laboratory procedure to collect and record data for a minimum of three trials.
  • Complete appropriate calculations to determine the concentration of Vitamin C in the fruit juice sample.  
  • Final concentration should be reported in mg/mL of Vitamin C in fruit juice sample.
  • Clean up and then submit your report showing all calculations on the back of the report page.


Time Limit:   75 minutes 


Judging

  • Description of methods, 30%
  • Description of safety concerns addressed within procedure, 10%
  • Presentation of Data and Calculations, 25%
  • Accuracy of concentration of Vitamin C in fruit juice sample, 25%
  • Time

Notes:

  • In the event of a tie, the team that completes this session in the shortest period of time will win the tie.
  • Teams must clean up and remove all materials that they bring to this event and return them to their own schools.  

 

ALL PARTICIPANTS MUST BRING (APPROVED) GOGGLES, GLOVES AND APRON OR LAB COAT, AND USE THEM AT ALL TIMES DURING THE COMPETITION.  STUDENTS MUST ADHERE TO BOTH GENERAL LAB SAFETY PROTOCOLS AND THOSE SPECIFIC TO THEIR CHOSEN PROCEDURE.