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D-6
swirl the flask very gently because you do not want the reaction to progress too rapidly. After the reaction
has proceeded for about one minute, continue to swirl the flask every 2 to 5 seconds to ensure that all of the
sulfamic acid reacts. The reaction is complete when bubbles no longer enter the buret after a gentle
continuous swirl of the flask (about 3 to 4 minutes after the start of the reaction).
Record the final water level in the buret (mL). Also, measure the height of the water column remaining
inside the buret. This height is “h” in Figure 2. Record the room temperature to 0.1°C; this temperature
will be used as the temperature of the gas in the buret.
NOTE: Be sure the bulb of the thermometer is dry when determining room temperature.
Flush the Erlenmeyer flask and vial four times with tap water and then rinse twice with deionized water.
Repeat the above procedure for an additional four runs using the volumes of the sulfamic acid solution and
initial buret levels as outlined below. For each run, remember to record the final volume in the buret and
the height of the water column remaining in the buret .
Run 2:
Repeat the experiment following the procedure given for Run 1 using ~ 10.xx mL of sulfamic
acid accurately measured. For Run 2 set the initial level of water in the buret to ~20 mL.
Run 3:
Repeat the experiment following the procedure given for Run 1 using ~ 13.xx mL of sulfamic
acid accurately measured. For Run 3, set the initial level of water in the buret to ~ 13 mL .
For this run, measure the temperature of the sulfamic acid solution in the Erlenmeyer flask with
your thermometer to 0.1°C and record the temperature as t1 on your Observations Sheet. Once
the reaction is complete, immediately remove the stopper from the Erlenmeyer flask and
record the final temperature of the solution in the Erlenmeyer flask. Record this as t2 on
your Observations Sheet.
Run 4:
Repeat the experiment following the procedure given for Run 1 using ~ 16.xx mL of sulfamic
acid accurately measured. For Run 4, set the initial level of water in the buret ~ 6 mL.
Run 5:
Repeat the experiment following the procedure given for Run 1 using ~ 19.xx mL of sulfamic
acid accurately measured. For Run 5, set the initial level of water in the buret to ~1 mL.
Before leaving the laboratory, check to make sure that all of your equipment is clean and put back in your
drawer. As well, all communal equipment must be cleaned and returned to the designated location in the
laboratory.
Remember to turn in the original copy of the Observations Sheet before leaving. The second copy of the
Observations Sheet should be kept in your laboratory manual for future reference.
