Now, there are several ways of purifying this stuff, but I am going to show you how to do it by recrystallization. The reason that I am going to show you this way is because it is the easiest way to do it in a home laboratory. The way this works is that all of the impurities will sink to the bottom of the beaker. the copper sulfate however will stay in solution and as the water evaporates the copper sulfate will crystalize on the seed crystal. This means that we can collect the crystals without getting the inpurities that have sank to the bottom.
DISCLAIMER: Copper Sulfate is dangerous. It can be harmful to you and can also be harmful to aquatic life if it gets is spilled and gets into water tables.
Step 1: What You Need
- Beaker (I used a 400ml beaker but you could use a larger one if you want.)
- Spoon or Magnetic Stirrer
Here are the materials I used:
- Copper Sulfate
- Popsicle Stick
And that's all you need.
Step 2: Setting Everything Up
Once you have your water measured out you need to assemble the string with your seed crystal. In my experiment I used a crystal that I had previously made as a seed crystal, but you can just use a string if you want. The seed crystal should be tied to a popsicle stick and suspended in the jar so that it is hanging in the middle. It is important that it is in the middle otherwise as the crystal grows it will bump into the sides of your beaker.
Step 3: Making the Copper Sulfate Solution
Now that you understand how all of this works we are ready to create our super-saturated solution. Make sure that your seed crystal isn't in the beaker and then poor in your 400ml of water. After pouring in your water slowly add the copper sulfate one spoonful at a time. The solution will slowly get darker and darker blue. Keep adding and stirring until no more copper sulfate will dissolve. Once no more copper sulfate will dissolve the solution is super-saturated. Now put in your seed crystal and put it all somewhere that it won't be disturbed.
Step 4: Waiting
Step 5: The Finished Product
Once you have collected all of the crystal that are pure you can st them out on a plate or watch glass to dry. And now you have purified copper sulfate.
Feel free to comment on any sugestions, questions, or anything else.
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