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D-9
OBSERVATIONS SHEET - EXPERIMENT D
*
DETERMINATION OF THE UNIVERSAL GAS CONSTANT
Barometric pressure: _________ (mm Hg)
Molarity of sulfamic acid:
M
Molarity of sodium nitrite:
M
Volume of
sulfamic acid solution
Volume of gas collected
Room
Vapor pressure
of water at
Height
of water
(buret readings to 0.02 mL)
(buret readings to 0.02 mL)
Temp
(t)
room temp
*(Show calculation
on back of page.)
column
after
reaction
Initial
reading
Final reading
Volume*
(mL)
Initial
reading
Final reading
Volume*
(mL)
(°C)
(mm)
of Hg
h (mm)
Run 1
Run 2
Run 3
Run 4
Run 5
Run 1
Run 2
Run 3
Run 4
Run 5
t1, temperature of solution in the Erlenmeyer flask before reaction
t2, temperature of solution in the Erlenmeyer flask after reaction
*Note: There is a small air space at the top of the buret not considered in this experiment. This dead volume can be ignored as the volume and pressure of
the air in it are nearly the same before and after the run. We will start measurements on the marked portion of the buret and ignore this dead
volume.
____________________________
__________________________________________________
Signature of Laboratory Instructor
Name of Student
Laboratory Section
*
Reminder - Observation Sheets (and Report Sheets) MUST be completed in ink.
