Lab Instructions

Materials and Equipment Distilled Water Zinc metal Filter Paper Plastic Wash Bottle Copper II sulfate Tap water Pencil (not a pen) Plastic funnel Glass stirring rod Balance Hot plate Beaker, 250 mL Flask, 250 mL Small beaker, 50 or 100 mL

Flask Beaker Plastic Funnel Plastic Wash Bottle Glass Stir Rod

Step 1 Equipment used – Beaker, 250 mL – Copper II sulfate – Distilled water Notes – You do not need to know the mass of the beaker or the mass of copper II sulfate you use in this step  Clean 250 mL beaker  Add grams copper II sulfate to the beaker  Fill the beaker to the 50 mL mark with distilled water

See Clips #1-2

Step 2 Equipment used – Beaker, 250 mL – Hot plate – Glass stir rod – Copper II sulfate Notes – Do not use anything metal to stir the solution – When all of the solid is dissolved the solution should look very clear and blue, not at all cloudy  Put the beaker on the pre- heated hot plate  Stir with the glass stir rod  Stir constantly until all of the copper II sulfate is dissolved  As soon as it is completely dissolved remove the beaker from the heat

After heating the solution will be clear and blue, with no visible pieces of the solid left (Note - clear and colorless are not the same thing)

Step 3 Equipment used – Zinc metal – Balance Notes – Use a small piece of paper to carry your zinc pieces – Put the paper on the balance, push zero, then add the zinc pieces  Obtain 9 zinc pieces  Record their exact mass in your data table

Step 4 Equipment used – Beaker, 250 mL – Glass stir rod – Copper II sulfate solution – Zinc metal Notes – Continue to use only the glass stir rod to stir – The solution needs to settle for at least 5 minutes before the next step, do not stir it at the end of this step  Slowly add the zinc pieces to the hot solution while stirring  Record your observations  Stir slowly, but constantly, for 5 minutes (even if you no longer see any changes happening)  Then let the solution sit for 5 minutes without being disturbed

See Clip #3 (0:54)

Step 5 Equipment used – Balance – Filter paper – Pencil Notes – If you skip this step you will have to start over – So, do not skip this step – You must use a pencil, not a pen, or the ink will run and you won’t be able to read it later  While you are waiting, weigh a single filter paper, record the mass in your data table  Use a pencil to mark the filter paper with your initials, so you know which one is yours later

Step 6 Equipment used – Beaker, 250 mL Notes – Do not mix, stir or in any other way disturb the beaker before this step!! – Decant into the small sinks in the middle of the lab counter – Be sure the drains in the sinks are unplugged first  After all of the copper has settled to the bottom of the beaker, carefully decant all of the extra copper sulfate solution in the beaker into the sink (without losing any of the copper)  You should be able to pour out most of the liquid if you pour slowly enough

See Clip #4 (1:26)

Step 7 Equipment used – Beaker, 250 mL – Water – Glass stir rod Notes – Turn the water on before you put the beaker underneath so the copper doesn’t get splashed out – Be careful that you don’t lose any copper when decanting  Fill the beaker close to the top with tap water and stir  Let the copper settle to the bottom and decant the liquid again  Repeat two more times

See Clip #5 (2:10)

Step 8 Equipment used – Flask, 250 mL – Filter paper – Plastic funnel Notes – Make sure that you are folding the filter paper correctly and that you didn’t forget to weigh it and label it in step 6  Set up the filtration system:  Fold the filter paper as shown in the clip  Place the folded filter paper into the plastic funnel  Place the funnel into the 250 mL flask

See Clip #6 (3:34)

Step 9 Equipment used – Beaker, 250 mL – Filtration Set-Up – Plastic wash bottle Notes – Be sure that the level of the water in the funnel never goes above the edge of the filter paper  Using a plastic wash bottle, wash the copper into your filter paper  Make sure that you get all of the copper out of the beaker and into the filter paper

See Clip #7 (4:10)

Step 10 Equipment used – Filtration set-up – Small beaker – Drying oven Notes – Be very careful not to tear the wet filter paper – If you set your beaker so the initials on your filter papers face forward it will be easier to find the next day  Let most of the water drain out of the filter paper and carefully remove it from the funnel  Place the wet filter paper and copper into a small beaker and put the beaker into the drying oven overnight

See Clip #8 (4:49)

Step 11 – Day 2 Equipment used – Balance Notes – Be sure you don’t spill the dry copper while weighing – Follow in class instructions for disposing of the filter paper and copper  Weigh the filter paper with the dry copper and record

End of Instructions