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CHM110H5 Lecture Notes - Barium, Silver Chloride, 2011 Nfl Season

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6 Dec 2013

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The underlying purpose of the experiment is to identify the identity of given unknown solutions by using only the other solutions as reagents. 2 (aq) + k+ (aq) + clo3 (aq) no reaction: 2na+ (aq) + so4. 2 (aq) + ba+2 (aq) + 2cl- (aq) baso4 (s) + 2na+ (aq) +2 cl- (aq: 2na+ (aq) + so4. 2 (aq) +k+ (aq) +io3 (aq) no reaction: 2na+ (aq) + so4. More detail; http://www. iccidd. org/pages/protecting-children/fortifying-salt/how-salt- is-iodized/iodate-or-iodide--more-detail. php; jan 1, 2012; accessed on sep 18, 2012. Sevagram, e; solubility rules; http://www. faculty. sfasu. edu/langleyricha/chem133/solubility. pdf; 2006; accessed on. Dean, john; barium chloride properties, solubility, applications; http://www. chemistry- reference. com/q_compounds. asp?cas=10361-37-2; 2011; accessed on sep 18, 2012. Precipitation worksheet; http://chemicalformula. org/worksheets/precipitation-reactions- worksheet. pdf; 2012; accessed on sep 18, 2012. Silver chloride applications and properties; http://www. azom. com/article. aspx?articleid=2305; jan 8, 2012; accessed on sep 18, Bbc gcse bitesize: anion test; http://www. bbc. co. uk/schools/gcsebitesize/ science/add_edexcel/ionic_compounds/ ionicanalysisrev5. shtml; 2011; accessed on sep. Dr. france, colin; gcse barium chloride test for sulfate ions; http://www. gcsescience. com/f21. htm; 2011; accessed on sep 18, 2012.

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Related Questions

Need help writing all the nie. Info givin with the page

In the synthesis of a diester experiment (Chemiluminescence) using 4-nitrophenol (procedure shown below), explain the significance / role of the reagents used:

-- What does triethylamine do?

-- What does oxalyl chloride do? Why must it be added slowly?

-- Why is a calcium carbonate drying tube used?

-- Why is cold acetone used to wash the solid product?

9. Test whether the obtained material exhibits chemiluminescence as described below Synthesis of the diesters You will perform this synthesis three times (once for each phenol). It is recommended that you set up one reaction, carry out the synthesis and then once you are done set up the last two reactions at the same time. It is recommended vou use a phenol from List 1 or List 2 first. Chemiluminescence You will perform this portion three times, once for each diester you prepare. It may be necessary to use a darkened roonm (lights off) to observe the chemiluminescence 1. Make sure that all glassware is dry Measure 4mL of a 0.6M solution of your chosen phenol in acetone and place this solution in a a 25 mL round bottom flask. Place a magnetic stirring bar in the flask. Add 0.35 mL of triethylamine to the flask. 1. Obtain 2 small glass vials or beakers 2. To the first vial, add 5mL of 3% hydrogen peroxide in acetonitrile. To the second beaker add 5 mL of a 0.002 M solution of either rubrene or 9,10-diphenylanthracene2 (these solutions are prepared for you) and several crystals of a single diester (a small spatula tip full). If you add too much ester you may not get good results. Make sure the crystals dissolve before proceeding. If your drawer is on the north side of the room (the TA's right) use rubrene, if 2. 3. Cool the mixture in an ice bath and, while stirring vigorously in the fumehood, slowly add 1.2 mL of oxalyl chloride dropwise. Allow the solution to stir momentarily after 4. 5. Add one drop of triethylamine Place a calcium carbonate drying tube on the flask. Remove the ice bath and stir the solution for 20-30 minutes at room temperature The color of the solution should be white or pale yellow. If the color of the solution becomes deep yellow add one or more drops of oxalyl chloride until the color of the reaction mixture turns pale yellow. our drawer is on the south side of the room (the TA's left) use 9,10- diphenylanthracene Move to the darkened hood and mix the two solutions. Record your observations both in vour notebook and on the board If you have time, you may also try anthracene as the dye (this is 3. 6. 4. 7. After the stirring is completed, filter the reaction, wash the solid with cold acetone, and allow the solid to dry over the filter paper. It is very important the all the acetone be In Lab Discussion After all the groups have completed the experiment, your TA will lead a discussion analyzing the results. This is partially for the benefit of those groups that might not have seen reliable results oved from the solid before continuing Obtain and IR spectrum of the diester you made from List 1. You do not need to obtain an IR of the other compounds 8. In your lab report make sure you

I need help getting the chemical equations in part 4

Factors Affecting the Rates of Chemical Reactions 25-5 4. The Influence of Temperature the test tube with the evolved gas. The gas coming (a) Measure 5 mL of solution A (used in part over first wl contain some air that was present in into a test tube. Measure 4 mL of water and mL flask. After 2-3 min, test the gas in the Erlen of 3% H2O2 into a second test tube. Place both test meyer flask by inserting a glowing splint into the tubes in a 250-mL beaker of warm water (50Â°C). flask. Does the gas support combustion? what is the After about 3 min H202 solution into a 50-mL beaker, stir, and note the time. When the blue color appears, note and only the H202 solution to the flask. Continuously record the elapsed time. Compare the reacton swirl the contents of the flask. Does the gas evolve time with that observed for the second reaction more slowly? After a few minutes' wait, you should be mixture you studied in part 1 pou r solution A and then the identity of the gas? Rinse the flask and repeat the experiment, adding able to tell whether the CuCl2 catalyzes the reaction. Now fill another test tube with water and place it (b) Ignition Temperature. Review the Safety Pre over the gas delivery tube. Remove the stopper just cautions. In a fume hood, place 10 to 20 drops of methanol in a 30-mL beaker. Remove the beaker to your lab bench. Heat the end of a glass stirring rod at the tip of the inner blue cone of a Bunsen burner until the glass starts to soften. Quickly drop of 3 M CuCl, and 1 drop of 3 M FeCl, in that touch the heated end to the methanol. A chemical reaction should begin; if it does not, reheat the swirl the solution in the flask, and record the time rod and try again. Stay at arm length from the required to fill a 13 x 100 mm test tube with gas. beaker Do not touch the beaker until it has cooled long enough to add 2 drops of 3 M FeCl. Insert the stopper and continuously swirl the solution. Note and Rinse the flask. Add to it 20 mL of 3% H2O2, 1 order. Quickly replace the stopper, continuously record the time required to fill the test tube with gas Repeat the procedure using 20 mL of 3% H2O2 Describe the reaction that takes place. Write a ba5 anced chemical equation for the reaction. Why doesn't methanol burst into flames at room tem- drops of 3 M CuC, and 5 drops of 3 M FeC Quickly stopper the flask and continuously swirl the contents of the flask. Note and record the time required to fill a 13 Ã 100 mm test tube with gas. exposed to air? (c) Obtain a small square of cotton cloth (muslin) and a book of matches. (The cotton cloth should be tightly woven, about 2 to 3 cm on a side, and cleanly cut, so there are no ragged edges.) Work- ing in a hood, place about 10 mL of 50:50 (vv) 2-propanol-water in a 50- or 100-m beaker. Using crucible tongs, grasp the square by one corner and dip it into the 2 propanol-water solu tion. Lift the cloth and allow the excess solution to drain until no more solution drips off the cot ton-Place a small watch glass over the solution in the beaker. Carry the cotton, still held in the tongs, to your lab bench. Have a lab partner light a match and bring it just near enough to the square of cotton (held in the tongs) to ignite the 2 propanol-soaked cotton. Make certain that no other person is within arm's length of the flaming cloth. When the flame dies out, carefully note the condition of the cloth. How can the 2-propanol 6. The Importance of Mixing Reactants (a) Half-fill two 13 Ã 100 mm test tubes with water. Drop a small crystal of solid KMno, into each tube. Put one tube aside in a test tube rack or beaker and let it remain undisturbed. Swirl the second tube to dissolve the crystal of KMnO Observe the crystal in the undisturbed tube every few minutes, noting how long it takes for the crystal to dissolve and then to spread (diffuse. Record your observations. (b) Add 10 mL of 0.50 M H2C204 (oxalic acid) to 10 mL of 6 M H2S04 and mix thoroughly. Place 8 mL of this solution into each of two 15 x 125 mm test tubes. Measure out two separate 8 ml por tions of 0.005 M KMno. Add one portion of KMno, solution to one of the test tubes contain- ing oxalic acid, holding the test tube at a 45 angle and carefully pouring the KMnO, down the side of the test tube to avoid mixing the two solu- tions. Note the time. Pour another 8 mL of KMno4 into the second test tube, stopper the tube, mix by inverting the tube several times, and note the time. As the reactions proceed, Mno will oxi- dize the oxalic acid to CO, and will itself be reduced to colorless Mn2+ ion. Record the times required for the solutions in the two test tubes to become completely colorless burn without igniting the cotton? S. Effect of Catalysts on the Rate of Decomposi- tion of HOz Using the same apparatus as in part 3a, place 20 mL of 3% H2O2 in the flask. Fill a 13 Ã 100 mm test tube with water and invert it over the gas delivery tube. Then add 20 drops of 3 M CuCh to the flask, replace the stopper, continuously swirl the contents, and note and record how long it takes to fill