Gas Law Experiment

1
Gas Law Experiment

• Purpose Obtain a piece of magnesium from your
  instructor and record its number. Determine the
  mass, in grams, of the magnesium without the use
  of a balance (the mass is too small to accurately
  mass on the electronic balances in this lab).  
•  

2
Gas Law Experiment

• Students have previously determined the molar
  volume of hydrogen using a traditional lab
  format.
• A detailed procedure for this lab was given and a
  standard laboratory report was written.

3
Gas Law Experiment

• In the nontraditional lab, no procedure is given
  and no data analysis is reviewed prior to the
  lab.
• A 2-5 cm piece of magnesium ribbon is massed by
  the instructor and given to each student.
• Hydrogen gas is collected as it was in the
  traditional lab.

4
Gas Law Experiment
5
Gas Law Experiment
6
Gas Law Experiment

• The ideal gas law is used to find the moles of
  hydrogen
• nPV/RT ( P barometric pressure vapor pressure)
• Stoichiometry is used to determine the mass of
  magnesium
• Mg 2HCl ? MgCl2 H2

7
Gas Law Experiment

• Nontraditional
• Student must determine mass without using a
  balance by employing a procedure performed in a
  previous lab
• Inquiry-Based
• Student must use knowledge of gas laws and
  stoichiometry to solve a problem not previously
  encountered in the lab

8
Gas Law Experiment

• Performance- Based
• Grade based upon accuracy
• May also grade calculations and additional
  questions