What you need to do before you perform this experiment: 1. Research all aqueous

Question

What you need to do before you perform this experiment: 1. Research all aqueous reaction types (Review Chapter 9 of your textbook). 2. Predict results of reacting the following solutions in specific combinations a. Determine characteristics of expected products. Use resources including solubility table (Table 9.1 Chapter 9 section 9.4, page 312) and CRC Handbook of Chemistry and Physics (ask a reference librarian). 3. Design a set of procedures or flowchart to expedite the process. Copy the procedure into your laboratory notebook. Bring your procedure to the exam and submit your procedure in the online dropbox on Canvas You will NOT be given a procedure to follow. Note! This preliminary work is essential for your efficiency and success on this project-prepare yourselves as thoroughly as possible. Use only reputable sources. Do not trust random strangers on the internet. THE MISSING LABEL PROBLEM: Dr. Erlenmyer has a problem he stored a rack of five bottles filled with clear colorless liquids too close to a heat vent and the labels fell off of each of the bottles. He needs your help in order to correctly identify each of the solutions. Below is a list of the solutions: 0.10 M NaOH 0.20 M BaCl2 0.50 M H2SO4 0.10 M AgNO 0.50 M NaCO The bottles are now labeled "A, B, C, D, and E". Match the letter on the bottle to the correct formula for the solute. You will need to develop your own procedure to solve this chemical puzzle. In solving the chemical puzzle, you will need to familiarize yourself'review/research the following topics Chemical Reactions involving aqucous solutions Acid-Base reactions Solubilities of lonic Compounds Identifying Gases and Precipitates Materials Provided: Phenolphthalein |Phenol pH paper (aka litmus paper) 5 Unknown solutions (labeled A, B, C, D, and E) litmus paper)- Well-plates for mixing CONTACT YOUR INSTRUCTOR IF YOU REQUIRE ADDITIONAL CHEMICALS TO PERFORM YOUR TESTS Exam Grading Protocol (20 points) Orderly, complete and accurate data table -5 pts. Correctly identify each solution-2 pts. each-10 pts. total Explanation of how you identified each solution 5 pts. 65

Explanation / Answer

Missing Label Problem:

1. Using the pH paper we can identify i) sulfuric acid --changes blue litmus to red

                                                                    ii) both NaOH and Na2CO3 -change red litmus to blue

2. Phenolphthalein also turns both NaOH and sodium carbonate into pink.

3.In the remaining two solutions, which are baCL2 and AgNO3, adding the sulfuric acid(already identified) , the one which gives a white precipitate is identified as BaCl2.

       BaCl2 + H2SO4 -----> BaSO4(s) + 2HCl

4. The last bottle which does not give any above tests can be taken as AgNO3.

5. To distinguish between the two solutions that are basic, add them to silver nitrate solution, the one which produces a black precipitate of silver oxide is sodium hydroxide.

2AgNO3 + NaOH -----> Ag2O(s) + NaNO3 +H2O

6. To confirm sodium carbonate solution, add a few drops of sulphuric acid solution , you notice bubbling , due to the evolution of carbon dioxide gas.

   H2SO4 + Na2CO3 -----> Na2SO4 + H2O +CO2

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