View
219
Download
3
Category
Tags:
Preview:
Citation preview
CHEM 1031
Stoichiometric Ratio
Procedure
PUT GOGGLES AND APRONS ON.
Equipment Needed (per pair):
• (2) 400 mL beakers
• (2) 100 mL graduated cylinders
• (1) desk thermometer
• (1) stirring rod
• (1) calorimeter cup (obtain from sideshelf)
Procedure (Continued)
RECORD DATA IN INK, AND PUT NAME,PARTNER’S NAME, AND DATE ON FIRSTDATA SHEET.• Obtain 350 mL of the 0.50 M NaOCl and
0.50 M Na2SO3 solutions in separate 400 mL beakers. OPEN AND CLOSE CARBOY VALVES VERY CAREFULLY.
• “Guesstimate” 350 mL above the 325 mL mark.
Procedure (Continued)
• Put thermometer in one of the beakers and measure and record temperature, estimating to the nearest 0.1oC. This is the initial temperature (same for all seven runs).
• Set up ring stand, calorimeter cup, and thermometer thus:
Procedure (Continued)
FOR EACH RUN:
• Measure out prescribed volumes of NaOCl and Na2SO3 solutions using separate
100 mL graduated cylinders.
Procedure (Continued)
• Combine solutions in calorimeter cup and stir with glass stirring rod.
Procedure (Continued)
• Measure and record maximum temperature to the nearest 0.1oC.
• Pour wastes down drain.
Procedure (Continued)
• Rinse calorimeter cup with tap water and return to sideshelf when done.
Recommended