Part I
Purpose
You will be supplied with three glass tubes of differeing diameters
but the same length.
Predict the effect of tube diameter on the length of time it takes
for ammonia gas (NH3) to diffuse the length of the
tube. Check your predictions, and use litmus paper to detect the
ammonia gas.
Caution
Ammonia gas is a poison. Minimize the time it is open to the
air by using a small amount in a closed container, and working with the
stock solution under the hood. Ammonium hydroxide solutions are "corrosive
to flesh" and you should avoid all skin contact.
Write-up:
Title Stuff
Hypothesis
Procedure (& drawing)
Data/Results
Analysis/Conclusions
Part II
Purpose
Concentrated hydrochloric acid releases HCl gas to the atmosphere,
and concentrated ammonium hydroxide releases NH3 gas
to the atmosphere. These two gases combine to form the solid NH4Cl,
which looks like smoke. If releases into opposite ends of a glass
tube at the same time, where in the tube will the "smoke" ring form?
Use yoru knowledge of Graham's Law to make a prediction.
Caution
Ammonia gas and hydrogen chloride gas are both poisons. Minimize
the time they are open to the air by using small amounts in closed containers,
and working with the stock solutions under the hood. Both solutions
are "corrosive to flesh" and you should avoid all skin contact.
Follow Up Questions
Calculate the speed with which the gas travelled down each tube.
Calculate the rate at which the gas filled the volume of each
tube (think about this). Report your results in mL/time. Discuss
these results.
Write-up
Title Stuff
Hypothesis (prediction with
calculation)
Procedure (& drawing)
Data/Results (with % error)
Analysis/Conclusions
Note: You can pass these in as one report with one Title Section.