Lab 13 - Redox Reactions

If something happened write r reaction in data table

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Unformatted text preview: eled "Mg" and zinc metal to the one labeled "Zn". 3 To each beaker, add 3 drops of phenolphthalein indicator. If something happened, write "R" (reaction) in Data Table A2 and make a brief note of what occurred in the space below it. If nothing happened, write "NR" (no reaction) in the space. Any reducing agent that reacted with the water is a stronger reducing agent than any which did not. 4 With the forceps provided by the waste jar, remove the metals from each of the three beakers. If no reaction occurred, rinse the metal with deionized water and place it on a paper towel to dry. This metal can be used in step 5. If a reaction did occur, place the metal in the Used Met al Jar. The liquids can be flushed down the sink with water. www.webassig n.net/ebooks/wsug encheml1/lab_13/manual.html 7/10 4/15/13 Lab 13 - Redox Reactions 5 Rinse and dry the beakers, then place a new sample of the metals that did not react with water in the properly labeled beakers. 6 Add about 10 mL of tap water to each beaker. 7 Go to the side shelf fume hood and add 10 mL of 3 M HCl solution to each beaker. If something happened, write "R" (reaction) in Data Table A2 and make a brief note of what occurred in the space below it. If nothing happened, write "NR" (no reaction) in the space. Any reducing agent that reacted with the acid is a stronger reducing agent than any which did not. 8 With the forceps provided near the waste jar, remove the metals from each of the beakers, rinse them with deionized water from a squeeze bottle and blot them dry. Place them in the Used Met al Jar. The liquids can be flushed down the sink with water. 9 Wash and dry all your equipment and return it to the set- up area where you found it. Table A2: Reactions of Reducing Agents Que s tion 3: List the reducing agents in order, from strongest to weakest. Que s tion 4: Write the half- reactions for the reducing agents in order, from weakest to strongest. (Hint : Remember that reducing agents get oxidized.) Que s tion 5: The strongest oxidizing agent is said to have the most positive potential and the strongest reducing agent has the most negative potential. Based on your observations, list all the half- reactions (as reductions) i...
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