CHM110H5 Study Guide - Midterm Guide: Burette, Hydrostatics, Torr

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Experiment 2
Behavior of Gases
October 17, 2014
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Purpose
An unknown sample of a metal had to be identified by determining the H gas moles produced
using the weight of the sample metal. The relative rates of diffusion of gases HCl and NH were
also to be identified by travelling distances in the test tube and reacting together. The ratio of
distances travelled was assumed to be the rate of effusion since it is not possible to determine
velocities of the gas molecules.
Experimental Method
Distilled water was mixed with 1 mol/L hydrochloric acid and placed in a beaker. The burette
was then filled with the solution and placed upside-down in the beaker. The burette was then
clamped. An unknown metal was sanded, weighed, and folded into a test tube. The test tube was
filled with distilled water and then inserted into the burette. The volume and temperatures were
measured after the reaction had completed.
Concentrated HCl and NH soaked separate cotton balls and were inserted on opposite ends at
the same time. The ends of the tube were sealed with a stopper. The reaction proceeded and a
mark was placed where the two gases reacted together. This was repeated for three trials.
Results
The unknown metal was silver, shiny, and very malleable. Once it was placed in the burette filled
with hydrochloric acid, it formed bubbles as the hydrochloric acid reacted with the metal. As the
reaction proceeded, gas began moving up the burette. Once the hydrochloric acid completely
dissolved the metal, the reaction ended and the gas stopped being produced. The volume of the
gas appeared to be significantly less than expected. This may have been caused by an
experimental error.
In Part B, the HCl travelled toward the NH as they were placed in the tube and formed a cloudy
white ring of gas which was NHCl when they reacted with each other. The NH appeared to
travel further than the HCl in all trials. This also could have been caused by an experimental
error described below.
Sample Calculations
Part A
1. Hydrostatic Pressure
(1.0g/mL) (325mm) = 13.69g/mL) (hHg)
hHg = 23.74 mm
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Document Summary

An unknown sample of a metal had to be identified by determining the h gas moles produced using the weight of the sample metal. The relative rates of diffusion of gases hcl and nh were also to be identified by travelling distances in the test tube and reacting together. The ratio of distances travelled was assumed to be the rate of effusion since it is not possible to determine velocities of the gas molecules. Distilled water was mixed with 1 mol/l hydrochloric acid and placed in a beaker. The burette was then filled with the solution and placed upside-down in the beaker. An unknown metal was sanded, weighed, and folded into a test tube. The test tube was filled with distilled water and then inserted into the burette. The volume and temperatures were measured after the reaction had completed. Concentrated hcl and nh soaked separate cotton balls and were inserted on opposite ends at the same time.

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