In order to receive credit for the experiments performed in this class, you must complete and turn in a lab report as described below.
The due dates for lab reports will be communicated to you by your lab instructor.
Turning in a late lab report could be subject to a late penalty or not acceptable based on discretion of your lab instructor.
Lab report for each experiment should contain the following:
A completed Report Form (available on profpaz website).
Report form should be completed neatly in ink, without excessive corrections.
Observations should be summarized based on your lab notebook, in a coherent and clear manner, utilizing proper scientific concepts learned in lecture and lab.
If calculations are required, they should include appropriate equation, substitution and answers with proper units and significant figures.
Conclusion or questions should be completed in a coherent manner based on results observed and obtained in the experiment
Some examples of notebooks pages that include the above criteria are provided on the following pages.
Example 1
TITLE
BOOK No.
1
DATE 9/17/09
30
NAME
Chad Landrie
PROJECT No.
x
FROM BAGE No. FIRST PAGE
Pre-Lab
Iitle: Lab 2- Chemical Proportionality: Carbonate AND Hydrochloric Acid
Introduction:
A solution of hydrochloric acid (HCI) in water can be neutralized by Adding a weak base such as . The probucts of this reaction are sobium chloride ( NaCl ), carbon dioxide ( ) and water ( ). The reaction is complete ( Al HCl has reacted) when the evolution of gas (seen as bubbles) ceases. In Part I of this experiment we will compare obsonations made when is added to a solution of ) and when it is addect to pare watoe. Since water is not a strong acid (neutral), I hypothesize that no reaction will take place When is addect to pure HO AND therefore No (seen as bubblas) will be seen. In papt II we will determine What mass of is required to neutralize various vidumes of HCl solution at 3 difforent concentrations. By determining the Number of moles of that are required to Neutralize each Number of moles of HCl , we can determine the ratio of chemical proportionality. Since we Already have the balancel equation, we are able to predict that the ratio will be 2:1 moles HCl to moles . Finally, in part IV, we will use the vame procedure to ident ify the Concentration of an unknown sample of HCl socution.
(5) Heat as sand baff or 131 block Churnon Hzo (itl)
Make sure pieces hit hogethe prupaly First; prectica assamilis BY. aturs reagents
(6) Heat to : let soln boil for 15 minuteo cipredure - lethert bult amognot need
(7) Remove frum heat, allow to cool h KCT ok to coul in water besth
(8) Remire curderse; net finteri: some beaker
(7) Add 3 mHzsey in increments untilset heaves white ppt throtremewn almixins ithenadd addn 0.5 mL (show take the
(40) Coolin icebath (beadcen/ice)
(11) Vacuren filtation al Mirsch Ennel
Fitter paper
EI Filte adgote to hite smal
(12) Tranfer sulid to weishing poper then to 10 mL Erlemmeyes fiste ardien corde! Surea br't
(13) Recrzatallization: add HzO + boiling strek or stune: hast to bail in hot phate. Add HzO in increments until all denerlues. Then add o-sml more Hzo. Note antsolvent
(14) Let cal theT on bench hpit then wal inice/water bath 5 minutes
ased AI black, a prom instruchis mfo
boilstart: 7:47 dm
boilend :
w
pommitor TO)
weight
V Haqued : 4.5mL many
(but sense evap)
crijuble
(14)
(15) Collect ergustets by vac. Filhation
(16) Rinseal cold ; ton pullair the for a four minutes
(17) Put on wakh glaw or paper + leave todry avalislaw or
(18) Once dr. bealong ble; placein
methrs point deming to needed) determine meltingpoint obtwin wespectrum cinstwe or aill
crystals are while and in the form of bantion long need lee
mass : 0.16 zs
(A) placein copillary himenl ove openend
(b) put thee in meltines soparats + heat slowly
(c) Nute to Ramse of melties
RESULFS
Calculations
metus/ saliaglate
Irmiting reagent is mekeglusionid.
this should all be parple since it wa done drunis an iffe. the lab
NIMR Radits
Metrubl salreylate has 8 unique cabons arid thus 8 prato in it NMR spectum. Salioglie add ha lest ame of treen-bens (tic ockb) soit is 7 carbing and 7 poak. The perth w 552 ppm for the oculy is gone in the spection of salroglic acid
SONKUSION
-Hacked to Lab Report sheet Yeu may paste trii in your lat noteboute
Example 2
This example combines the Procedure and Data & Observations into one section and shows the difference between initial observations made in the lab and summarizing of the results in the Report Form.
HYDRATED CRYSTALS
Purpose:
This experiment explores the physical and chemical properties of hydrated crystals.
Procedure/Data & Observation
Heat small sample of copper sulfate crystals
Place some crystals in test tube and add water
Crystals appear blueish before heating
After heating for 5 min crystals become white on the outside
After heating for 10 min longer crystals become all white
After adding water, crystals become blue again
Crystals do not dissolve in water
Results:
Before heating, copper sulfate crystals appeared blue in color. After heating, crystals began losing color and become progressively whitish in color. This process began quicker on the surface of the crystals, till eventually all the crystals become white in color after 15 minutes. The dried crystals were placed in a test tube and water drops added to them. After adding water, the crystals regained their blueish color but did not dissolve in water.
