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2.4

Major VersionM

by Raghottam Joshi

Introduction

A saturated solution of copper sulphate is allowed to cool in a container. Over time (several hours to days) crystals start forming at the bottom of the container. By routinely filtering out the solution and re-introducing the filtered solution to the growing crystal(s), one should be able to grow large, blue crystals of copper sulphate

Video Overview

  1. Make a test tube stand and holder using an ice cream stick, binding wire and foam piece.
    • Make a test tube stand and holder using an ice cream stick, binding wire and foam piece.

    • Refer to the DIY Test Tube Stand guide to make one.

    • Always use the Test Tube Holder while using a test tube.

    • Do not touch the test tube immediately after heating.

    • Do not ingest any of the chemicals.

  2. Make pinholes in the lid of the plastic container using a board pin. Make pinholes in the lid of the plastic container using a board pin. Make pinholes in the lid of the plastic container using a board pin.
    • Make pinholes in the lid of the plastic container using a board pin.

  3. Fold the filter paper twice. The first fold should give you a semi-circle shape, and the second fold gives a quarter circle. Note that the second fold will give you four flaps as you try to open it to get a cone. Note that the second fold will give you four flaps as you try to open it to get a cone.
    • Fold the filter paper twice. The first fold should give you a semi-circle shape, and the second fold gives a quarter circle.

    • Note that the second fold will give you four flaps as you try to open it to get a cone.

  4. Separate the flaps such that you get three flaps on one side and one flap on the other side. Tape the 3 flap side together to get a cone. This cone itself is your funnel.
    • Separate the flaps such that you get three flaps on one side and one flap on the other side.

    • Tape the 3 flap side together to get a cone.

    • This cone itself is your funnel.

  5. Pour 5g of copper sulphate powder into the test tube mounted on the stand. Add 7 ml of water using a dropper. Add 7 ml of water using a dropper.
    • Pour 5g of copper sulphate powder into the test tube mounted on the stand.

    • Add 7 ml of water using a dropper.

  6. Heat the mixture to dissolve the copper sulphate powder. Keep the test tube slightly tilted to heat the side walls near the bottom and shake it a bit, as you keep heating.
    • Heat the mixture to dissolve the copper sulphate powder.

    • Keep the test tube slightly tilted to heat the side walls near the bottom and shake it a bit, as you keep heating.

    • Don't let the flame touch the test tube. Keep the test tube slightly above the flame to avoid black soot formation on the base of the test tube.

  7. Make sure the powder is completely dissolved. Pour the solution into a plastic container through the prepared filter paper cone.
    • Make sure the powder is completely dissolved.

    • Pour the solution into a plastic container through the prepared filter paper cone.

  8. The solution will stop dripping through the filter paper if and when the solution touches the cone inside the container. Raise the cone to allow the solution to continue dripping. Throw away the residue crystals (if any) left inside the cone after filtering.
    • The solution will stop dripping through the filter paper if and when the solution touches the cone inside the container.

    • Raise the cone to allow the solution to continue dripping.

    • Throw away the residue crystals (if any) left inside the cone after filtering.

    • Important: Prepare one more solution of 5g CuSO4 in 7 ml of water by repeating Steps 4 to 7.

    • This will make a total of 10g of CuSO4 in 14 ml of water.

  9. Close the container with the lid and keep it undisturbed for 24 hours. The holes in the cap were made so that evaporation occurs naturally while the solution in the container is kept aside. The holes in the cap were made so that evaporation occurs naturally while the solution in the container is kept aside.
    • Close the container with the lid and keep it undisturbed for 24 hours.

    • The holes in the cap were made so that evaporation occurs naturally while the solution in the container is kept aside.

  10. After 24 hours, you may see that some small crystals have formed at the bottom of the container. After 24 hours, you may see that some small crystals have formed at the bottom of the container.
    • After 24 hours, you may see that some small crystals have formed at the bottom of the container.

  11. Filter out the solution into a clean container. The small crystals will stay back inside the cone after filtration. The small crystals will stay back inside the cone after filtration.
    • Filter out the solution into a clean container.

    • The small crystals will stay back inside the cone after filtration.

  12. Carefully remove the crystals and place them on a clean surface. Thoroughly wash the container that was being used to grow the crystals. Thoroughly wash the container that was being used to grow the crystals.
    • Carefully remove the crystals and place them on a clean surface.

    • Thoroughly wash the container that was being used to grow the crystals.

  13. Among the crystals formed, choose the piece that's grown the biggest and put it back into the original container. Pour the filtered solution back into this container. After choosing the biggest crystal, you may dispose of the remaining smaller crystals that had formed.
    • Among the crystals formed, choose the piece that's grown the biggest and put it back into the original container.

    • Pour the filtered solution back into this container.

    • After choosing the biggest crystal, you may dispose of the remaining smaller crystals that had formed.

  14. Secure the lid on the container. Keep the container undisturbed, and after 4 days observe the size of the crystal. Keep the container undisturbed, and after 4 days observe the size of the crystal.
    • Secure the lid on the container.

    • Keep the container undisturbed, and after 4 days observe the size of the crystal.

  15. It may take one or two weeks to get a significant increment in the size of the crystal. You may do the filtration process described in the previous steps every 4-5 days, if smaller crystals continue to form separately. Pour out the solution to take out the final crystal.
    • It may take one or two weeks to get a significant increment in the size of the crystal.

    • You may do the filtration process described in the previous steps every 4-5 days, if smaller crystals continue to form separately.

    • Pour out the solution to take out the final crystal.

    • Copper sulphate powder not dissolving - Make sure the solution is heated adequately.

    • Test tube becomes black - Make sure you hold the test tube a little bit above the flame.

    • Crystals not formed even after 24 hours - Keep the solution in a cool dry place and do not disturb.

  16. Variation 1: Grow Potassium Di-chromate crystals. Variation 2: Grow Cupric Acetate Monohydrate crystals. Variation 3: Grow Aluminium Potassium Sulphate Dodecahydrate crystals.
    • Variation 1: Grow Potassium Di-chromate crystals.

    • Variation 2: Grow Cupric Acetate Monohydrate crystals.

    • Variation 3: Grow Aluminium Potassium Sulphate Dodecahydrate crystals.

    • Go to the DIY Copper Sulphate Crystals (Variations) to try some of these.

Finish Line

Vishal Bhatt

Member since: 04/26/2017

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