CHEMISTRY WITH MASTERCHEM&LAB MANUAL PKG 6th Edition. Author: John E McMurry, Robert C Fay ISBN: 818 Edition: 6th View 2993 solutions ».
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.)
Sign in to like videos, comment, and subscribe. Watch Queue Queue.
Foundations of Chemistry in the Laboratory, 14th Edition. ISBN: 978-1-1182-8899-3. Intended for Intro or Prep Chemistry, this market-leading and bestselling lab manual includes 28 experiments for a laboratory program that may accompany a lecture course.
(3 pts)Define the following terms:a) decantb) supernatantc) precipitate
(1 pt)Consider the following chemical reaction:
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.
·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+.
·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.
Welcome to the Home Page of Chem 107: General Chemistry Lab I
Lab Manual: Cooper, M., Cooperative Chemistry Laboratory Manual; 4th edition
Corequisite: CHEM 105, General Chemistry I
Welcome to Chemistry 107, General Chemistry Lab I. Chemistry is an important science involved in many areas, as chemists seek means to improve the quality of life. From the food we eat, to the clothes we wear, to energy, our health and the environment, chemistry plays a central role. Scientists studying the mysteries of the human body, the future health of our planet, and the farthest reaches of the universe need an understanding of basic chemical principles. It is important to note that our understanding of chemistry has largely been developed through centuries of rigorous laboratory experimentation.
The format of this course is different from other courses you may have encountered. Instead of performing one lab exercise each week, you will become members of a group working on assigned, open-ended projects. As such, the goals of this first course in laboratory chemistry are to:
Gain experience in working in a group environment
Give you experience in solving scientific problems by having to plan, execute, evaluate, and present experiments designed by your group
Introduce you to the methods scientists use to communicate scientific data, including the scientific paper and oral presentation
Apply computer-based molecular modeling to topics you studied in your lecture course
Your group will complete 4 projects this semester. You will work in groups to design and carry out your own experiments to meet the goals of a multi-week project, as if you were part of a research group in a professional lab. Your project will culminate in a brief written lab report and one project will include an oral report. You will not be graded on how close you come to an answer, but how you plan, execute, evaluate, and present experiments designed by your group.
In addition, there will be one computer-based molecular modeling experiment which will introduce you to how scientists use computer-based molecular modeling in their research. With the increased presence and power of computers and sophisticated software, many properties of new substances, such as geometry or energy, may be successfully calculated. Indeed, some properties that can be calculated cannot be directly measured. In this modeling lab experiment, you will use a Silicon Graphics UNIX workstation and become familiar with Spartan modeling software to calculate the physical properties of simple molecules under conditions difficult to achieve in the lab in order to arrive at other physical properties, including bond dissociation energy and equilibrium bond length. The information gained through the process of molecular modeling often serves professional chemists as a guide to further experimental work in the design and synthesis of new materials.
This website provides valuable information for the course. Be sure to review all the information in the links below. Your success in this lab will depend on your preparation. For example, be sure to read the background material for each cooperative lab project and the molecular modeling lab before coming to lab. Simcity 2000 mac. If you have specific questions, be sure to see your lab instructor before coming to lab.