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CHEM 1031

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).

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CHEM 1031

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  1. CHEM 1031 Stoichiometric Ratio

  2. 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)

  3. Procedure (Continued) RECORD DATA IN INK, AND PUT NAME, PARTNER’S NAME, AND DATE ON FIRST DATA 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.

  4. 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:

  5. Procedure (Continued) FOR EACH RUN: • Measure out prescribed volumes of NaOCl and Na2SO3 solutions using separate 100 mL graduated cylinders.

  6. Procedure (Continued) • Combine solutions in calorimeter cup and stir with glass stirring rod.

  7. Procedure (Continued) • Measure and record maximum temperature to the nearest 0.1oC. • Pour wastes down drain.

  8. Procedure (Continued) • Rinse calorimeter cup with tap water and return to sideshelf when done.

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