My method for seperating lead shots, copper sulphate and iron filings. (1 Viewer)

[Twickel]

1. Weigh four beakers and an evaporating basin, using a balance, record the weight of each item into book.
2. Pour mixture of iron Filings, Copper Sulphate and lead shots into beaker one record weight into notebook.
3. Calculate mass of mixture using following formula Mass of mixture= Weight of beaker1+ mixture- weight of beaker 1.
4. Separate iron filings from mixture using bar magnet, place iron filings into beaker 2 and record weight.
5. Calculate percentage composition of iron filings in the original mixture using the following formula. Iron filings= Weight of beaker 2+ iron filings – weight of beaker 2.
Percentage composition of iron filings= mass of iron filings/ mass of original mixture * 100 = x%
6. Add 20mls of water to beaker one, to dissolve the copper sulphate
7. Set up the equipment required to filter out the leas shots from the copper sulphate solution.
8. Pour solution into filter funnel. Allow the solution to filer.
9. Collect the filtrate into a separate beaker.
10. Place the lead shots on the filter paper into beaker number 4. Record the weight of this.
11. Calculate percentage composition of lead shots using the following formula. Weight of lead shots= beaker 4 + lead shots – the weight of beaker 4. % composition of original mixture= mass of lead shots/ mass of original mixture* 100.
12. Set up the equipment required to evaporate the filtrate( water + dissolved copper sulphate)
13. Evaporate the water in to solution and recover the copper sulphate back into beaker 3
14. Calculate the mass and percentage composition of copper sulphate using the following formula. Weight of copper sulphate crystals = Weight of beaker 3 + copper sulphate crystals – weight of beaker 3. % composition of original mixture = mass of copper sulphate/ mass of original mixture * 100.
15. Record data into table.
Pack away all equipment

How can I get the iron filings not to stick onto the bar magnet?

Is this right, does it make sense, feel free to edit it to make it better.

 

[brenton1987]

Use an electromagnet to collect the iron so you can turn the magnetism on and off.
Dry the lead shot before weighing it.

 

[Twickel]

Here is my justifyng of the method.

The method I have chosen to separate the mixture of Iron Filings. Copper Sulphate Crystals and Lead Shots is reliable and accurate. Their will be plenty of time to complete the separation process and gravimetric analysis. Before we begin separating the three substances we first must label and weigh four beakers and an evaporating basin. We then tip the mixture of Lead Shots, Iron Filings and Copper Sulphate into beaker 1; we will now be able to calculate the total mass of the original mixture given to us by our teacher using the following formula. Mass of mixture= Mass of Beaker 1+ Mixture- Weight of empty Beaker1. This is done so I can compare the starting mass of the mixture to the end mass of the mixture, to see if I am within the 1-2% error margin, this makes the method very accurate and reliable.
The first thing we need to do to separate all three items from each other is, remove the Iron Filings using a bar magnet wrapped in a sheet of paper. The bar magnet is wrapped in a sheet of paper because the iron filings are Ferromagnetic (one of the physical properties of Iron), this means they will be stuck onto the magnet, the sheet of paper is used so we will be able to easily drop the iron filings into Beaker 2 without losing much of the original amount of iron filings. Another reason why the Iron must be removed first is because, it will react with the water we must add, to the copper sulphate to dissolve it (seen on the chemical properties of Iron). This process should take a maximum of five minutes giving us plenty of time to separate the lead shots from the copper sulphate.
Now we must separate the Lead Shots from the Iron filings, looking at our table of Physical properties we know that the Copper Sulphate crystals are Soluble, we must add approximately 15ml of water to the mixture of Lead shots and Copper Sulphate Crystals and stir it to speeden up the process, and this should take a few minutes. Once our Cooper Sulphate is dissolved we are left with a mixture of Copper Sulphate solution and Lead Shots, we know that when we have one substance in the state of a liquid and one in a solid we must use filtration to separate the two substances. We must now set up all the equipment required to filter the substances, these include a beaker (number 3), filter paper, filter funnel a retort stand and a clamp. Now we pour the copper sulphate solution slowly into the filter paper, this is to ensure proper filtration and to prevent the lead shots from dropping onto the filter paper and blocking the hole or ripping the filter paper. Again this should take a maximum of ten minutes. Now collect the filter paper which contains the lead shots and place the lead shots into beaker 4 wait for the lead shots to dry and then calculate the mass of lead shots using the following formula, mass of lead shots= mass of beaker 4+ Lead shots- Beaker 4. This is safe and accurate.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
We now know the mass of the Iron Filings and Lead Shots. Now we must evaporate the water that was added to the Copper Sulphate, we know this because water has a lower boiling point then copper Sulphate. Set up the equipment required to evaporate, this includes a Bunsen burner, tripod, gauze mat and evaporating basin. Pour the Solution into the evaporating basin and vaporise the water now calculate the mass of Copper Sulphate using the following formula. Mass of Copper Sulphate= Mass of evaporating basin+ Copper Sulphate crystals- Mass of evaporating basin. This is safe and accurate.
Now that we have successfully separated all three substances and calculated the mass of each, we can find the percentage composition of each item, we do this by using the following formula.
% composition of substance = mass of substance/ mass of total mixture*100.<o></o>
One tiny problem that may affect the accuracy of this experiment is the weighing of each substance, as there are many people who need to use the scale and as the scale is very sensitive to even the slightest movements the results may be off by a couple tenths of a gram. A calculator is used to calculate all the results to provide accurate answers.

 

[Twickel]

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