Each group needs:

• 8 g citric acid (C₆H₈O₇)
• 10.4 g sodium bicarbonate (baking soda)
• 40 ml water
• 2 quart-size ziplock bags
• thermometer (approximate range: 0-200 °F)
• syringe (approximate size 4 ml, for taking gas sample)
• tape measure
• calculator
• colored tape to seal syringe
• safety glasses, pair per student
• Exposed Reaction Worksheet

To share with the entire class:

• stopwatch
• (optional) use of GC for data analysis of CO₂ production; the production of CO₂ can also be estimated through calculations using the stoichiometric balance of the reaction equation