Aug 31, 2020 The Chemistry program features a wide variety of class sizes, types, and delivery methods. Most general chemistry courses consist of 3 hours of lecture per week (class sizes of ca. 360) presented by PhD level faculty, in addition to 1 hour of recitation and 3 hours of laboratory (class sizes of ca. 22 students) supervised by a graduate student teaching assistant. Elementary Chemistry Lab is a concurrent requirement of Elementary Chemistry (Chem 107). It is designed to illustrate chemical principles and teach fundamental techniques. You must pass. The lab portion of the class in order to pass the course. REQUIRED MATERIALS: Chemistry 107 Lab Manual 2006. Lab Safety Package: Chem 107, by Chem Dept.
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CHEM 107 General Chemistry Lab I
Qualitative Analysis Scheme -Prelab
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Before coming to lab, you should:
- Read the assigned background reading in Cooperative Chemistry Laboratory Manual and in Chemistry and Chemical Reactivity (See laboratory handout for page numbers.)
- Answer the following questions on a separate sheet of paper :(Turn in to your lab instructor at the beginning of lab.)
- (3 pts)Define the following terms:a) decantb) supernatantc) precipitate
- (1 pt)Consider the following chemical reaction:
![Manual Manual](https://www.coursehero.com/thumb/8e/2e/8e2e2ed027076c630c61ea912b2b8920c7aab360_180.jpg)
AgNO3(aq)+NaCl(aq) →AgCl+NaNO3
In this chemical reaction, a precipitate formed.What is the precipitate that formed?
- (1 pt)This is a qualitative experiment.What does this mean?What will you be looking for in this experiment?
- (5 pts)The following problem is an example of a qualitative analysis experiment using precipitate reactions to remove ions sequentially from a mixture. This example will familiarize you with a flow chart, which is a graphical representation of the procedures and the results.
The mixture contains 3 ions, Ag+, Pb2+, and Na+.The three ions must be separated from this solution.This experiment will only be done on paper in order to familiarize you with the process of generating a flow chart.
STEP 1: Procedure
·Add 4 drops of 6M HCl to 10 drops of the test solution (the test solution is the solution containing all three ions, Ag+, Pb2+, Na+).Decant the supernate into a clean test tube and savefor STEP 3 and save the ppt for STEP 2.
STEP 1:Flow Chart
·When HCl is added to the test solution, a precipitate (ppt) forms in the bottom of the test tube.What is this ppt?Use the Solubility Guidelines on page 60 of your lab book to determine what solid formed.
Chemistry Lab Manual Pdf
·Notice from the Solubility Guidelines that all chlorides are soluble except Ag+ and Pb2+ ions.Therefore, the following reactions took place when HCl was added to the test solution:
§Ag++Cl-®AgCl(s)
§Pb2++Cl-®PbCl2(s)
·The Na+ ion remains in solution.Now we have a test tube with a liquid and a solid.The liquid was separated from the solid.
·Next, this process must be represented in a flow chart before continuing with the experiment.In the flow chart, you want to record procedures, results, and observations.The flow chart for step 1 is done for you.
STEP 2:Procedure
·Add 15 drops of distilled water to the ppt obtained in STEP 1 and place the test tube in a hot water bath.Centrifuge and decant the supernate.Save the ppt for STEP 3.To the supernate, add 3 drops of 1M Na2CrO4.The formation of a yellow ppt, PbCrO4, confirms the presence of Pb2+.
STEP2:Flow Chart
·PbCl2 is soluble in hot water while AgCl is not.Therefore, the test tube now contains a liquid and a ppt.The ppt is _______________ and the supernate contains the ___________ ion.
·Next, this process must be represented in a flow chart before continuing with the experiment.
·Complete the flow chart to represent the procedures and results from step 2.Indicate in the flow chart, that hot water was added to the ppt from step 1.Next, indicate that the ppt contains the silver ion and that the supernate contains the Pb2+ ion.Next, indicate that 3 drops of 1 M Na2CrO4 was added to the supernate (which contains the lead ion).A yellow ppt (PbCrO4) formed confirming the presence of Pb2+.
STEP 3:Procedure
·Add 10 drops of 6M NH3 to the ppt from step 2.The ppt must be completely dissolved.
·Next, add 20 drops of 6M HNO3.The solution must be acidic.Stir the solution and test its acidity.Continue to add HNO3 dropwise until the solution is acidic.A white cloudiness confirms the presence of Ag+.
STEP 3:Flow Chart
·Complete the flow chart to represent the procedures and results from step 3.
STEP 4:Procedure
·To confirm the presence of Na+, perform a flame test.The sodium ion will impart a characteristic yellow color to the flame.
STEP 4:Flow Chart
·Complete the flow chart to represent the procedures and results from step 2.
Fundamentals Of Chemistry I - ELAC
DEPARTMENT NEWS
Eriks Rozners wins the 2021 Melville L. Wolfrom Award
Eriks Rozners, Professor and Chair of Chemistry has been selected to receive the 2021 Melville L. Wolfrom Award from the Division of Carbohydrate Chemistry, American Chemical Society. The Melville L. Wolfrom Award recognizes individuals who have provided outstanding service to the Division of Carbohydrate Chemistry and the field of carbohydrate chemistry. Professor Rozners will receive the award during the ACS National Meeting next March in San Antonio.
Dr. Hao Liu's group, in collaboration with Dr. Louis Piper and Dr. Manuel Smeu groups from Physics Department, has received a three-year NSF award (CBET-2028722, $605,209 in total) . This award, entitled 'Rational Design of Oxide Cathode Coatings for High Performance Li-ion Batteries', will investigate the fundamental role of surface coating layers in battery electrodes. Surface coating is widely used as a practical method to improve the performance of Li-ion battery electrode, yet its impact on Li-ion transport and electrode-electrolyte interface stability is not well understood. The research will provide insight into atomic-level processes in order to guide the development of robust coating layers that can be scaled up into manufacturing-grade testing.
Dan Ciulla, first recipient of the prestigious John Eisch Summer Fellowship.
Congratulations to Dan Ciulla, 2nd year PhD student (Callahan Group), as the first recipient of the prestigious John Eisch Summer Fellowship. Following the example set forth by Professor Eisch, Dan is a dedicated scholar, tireless worker and fearless experimentalist. Dan fully embodies the theme of the John Eisch Summer Fellowship: Chemical Research Beyond Expectation.
Despite a relatively short time in our Chemistry PhD program, Dan already has 5 peer-reviewed publications, a list that includes two first-author publications, one in JACS and one in ChemComm, and a co-first author publication, also in JACS. Dan’s first-author paper in JACS was selected by the journal editors as the cover feature!
In his most recent work, Dan is applying the revolutionary CRISPR/Cas gene editing technology as a means toward discovering new and more effective cancer therapies. Dan’s newly created research tools have paved the way for an exciting collaboration focused on cancer drug discovery involving the Callahan lab and the National Institutes of Health.
Chemistry Ph.D. student receives Frontera Computational Science Fellowship
Maureen Kitheka, a third-year Ph.D. student in the Goyal group, has been awarded a Frontera Computational Science Fellowship for 2020-2021 by the Texas Advanced Computing Center (TACC) in order to carry out research on charge transport in organic battery materials. As part of this fellowship, Maureen will receive 50,000 node-hours on Frontera, paid summer residence at TACC, training on the latest tools in advanced computing, and collaboration/networking opportunities. She will also receive an annual stipend of $34,000 and support for travel to a Frontera user community event and/or professional conference. For more information or department news, click here.
Grewer Laboratory receives major NIGMS grant
Chemistry 107 Quizlet
Dr. Grewer's laboratory has been awarded a NIH grant (1 R15 GM135843-01, $450,480, three years) with the title 'How to Combat Glutamate Release by Reverse Transport: Mechanistic Studies and Development of Selective Efflux Inhibitors.' For more information, click here.
FEATURED PUBLICATION
Dimitrov Group
The Dimitrov group reported on the development and application of all-electrochemically synthesized nanoporous (np) Au-Cu-Pt alloy thin film as catalysts for formic acid oxidation (FAO) reaction. The work emphasizes a pursuit of most efficient catalytic routes for the production of clean energy like by smart materials design at atomic level, involving controlled alloy electrodeposition followed by oxidative copper removal. For more information, click here.