The Sequence of Chemical Reactions
INTRODUCTION This experiment was to recover the most amount of copper after it
is subjected to a sequence of reactions. The copper is originally in solid
form, but the reactions will turn it into free Cu+2 ions floating in solution.
The ions will then be regrouped to form solid copper once again. During this
process, however, some of the Cu+2 ions may be lost. The copper will subjected
to changes in pH and heat. These steps were responsible for the breakdown and
reconstruction of the copper. The percent of copper retrieved will reflect the
skill with which the reactions were administered.
EXPERIMENTAL On an analytical balance, measure the mass of the copper while in
the vial. Remove approximately 0.35 g into a 250 mL beaker. check the balance
and record the mass of the remaining mixture in the vial. In the laboratory
hood, dissolve the copper with ~ 3 mL of nitric acid. Allow the beaker to
remain under the hood until the fumes cease. The remaining solution should be
blue. Bring the beaker back to the lab station and add ~ 10 mL of distilled
water. Stir the mixture, all the while adding ~ 8 mL of 6M of NaOH to the
beaker. Check with litmus paper to ensure that it is slightly basic. Fill the
beaker with up to 100 mL mark with distilled water. Heat the solution and allow
it to boil for 5 minutes. Prepare a squirt bottle with hot water. Filter the
solution and rinse the beaker with the hot water. Rinse the filter cake with
hot distilled water. Transfer the filter paper into a clean beaker. Add ~ 10
mL of 3M sulfuric acid to the beaker in order to dissolve the filtrate. Remove
and rinse the filter paper. Now add ~ 0.35 g of zinc powder to the solution and
stir until the solution becomes clear. Dissolve the excess zinc with more
sulfuric acid. Decant the liquid with a stirring rod, retaining only the copper.
Rinse the copper with distilled water and steam dry. Weigh the mass.
DATA/RESULTS initial mass of copper (g) 0.319 final mass of
copper (g) 0.305 % recovery = (final mass/initial mass) x 100
95.6
OBSERVATIONS -between steps 1 through 4 the solution is blue. -between steps 5
through 8 the solution is dark brown. -between steps 9 through 12 the solution
is blue-green. -between steps 13 through 16 the Zinc turns red as the blue color
slowly leaves the solution.
CALCULATIONS % Recovery = (final mass / initial mass) x 100 % Recovery = (0.
5.) One at a time, place your test tubes in the water bath and heat the first test tube to 25 , the second to 50 , the third to 75, and the last to 100 degrees c. Remeber to stir with your stirring rod every so often.
Switch to a solution of 1 part water to 1 part ammonia or 1 part water to 1 part hydrogen peroxide....
1. Put 400 mL of tap water into a beaker. Heat it on a hot plate until it starts to boil.
in 5cm³ of water and add 4cm³ of ethanol. We had tom pour this mixture
About 25ml of distilled water was added. Then 2-3 drops of phenolphthalein indicator solution were put in. It was swirl to dissolved the solid.
neutralize 35ml of our base. Once we weighed out the KHP we then dissolved it
3. Fill up the 50 milliliter beakers all the way up with deionized water. After, use your scopula to scoop out a small portion of one substance and put in into your beaker. Then put your hot plate onto medium temperature and rest the mixture onto the plate.
4. Pour about 300mL of tap water into the beaker. Set up a hot-water bath using a hot plate, retort stand, and thermometer clamp. Alternatively, use a Bunsen burner, retort stand, ring clamp, thermometer clamp, and wire gauze.
of distilled water. For the 1M solution I added 50 cm3 of HCl and 50
Remove the metal object from the first beaker and insert it into the second one.
Remove the extra solvent on a steam bath under a hood while flushing the flask with N2 gas, leaving the crude extract. Weigh extract.
tube. Add 6 mL of 0.1M HCl to the first test tube, then 0.1M KMnO4 and
of Copper Sulphate. To do this I plan to work out the amount of water
2nd step heat the mixture: Make sure the agarose dissolves. Wait until it boils and when you are going to transfer the mixture, wear gloves to avoid getting burnt. Transfer the mixture into a removable gel tray.
In a 100ml beaker place 50mls of water, measure the temperature of the water and record this initial temperature onto a table. Set the timer and add one teaspoon of Ammonium Nitrate to the water, stir this continuously until the Ammonium Nitrate has dissolved.