Watch a copper tree grow inside a vial!
- Put on protective gloves and eyewear.
- Conduct the experiment on the plastic tray.
- Do not allow chemicals to come into contact with the eyes or mouth.
- Keep young children, animals and those not wearing eye protection away from the experimental area.
- Store this experimental set out of reach of children under 12 years of age.
- Clean all equipment after use.
- Make sure that all containers are fully closed and properly stored after use.
- Ensure that all empty containers are disposed of properly.
- Do not use any equipment which has not been supplied with the set or recommended in the instructions for use.
- Do not replace foodstuffs in original container. Dispose of immediately.
- In case of eye contact: Wash out eye with plenty of water, holding eye open if necessary. Seek immediate medical advice.
- If swallowed: Wash out mouth with water, drink some fresh water. Do not induce vomiting. Seek immediate medical advice.
- In case of inhalation: Remove person to fresh air.
- In case of skin contact and burns: Wash affected area with plenty of water for at least 10 minutes.
- In case of doubt, seek medical advice without delay. Take the chemical and its container with you.
- In case of injury always seek medical advice.
- The incorrect use of chemicals can cause injury and damage to health. Only carry out those experiments which are listed in the instructions.
- This experimental set is for use only by children over 12 years.
- Because children’s abilities vary so much, even within age groups, supervising adults should exercise discretion as to which experiments are suitable and safe for them. The instructions should enable supervisors to assess any experiment to establish its suitability for a particular child.
- The supervising adult should discuss the warnings and safety information with the child or children before commencing the experiments. Particular attention should be paid to the safe handling of acids, alkalis and flammable liquids.
- The area surrounding the experiment should be kept clear of any obstructions and away from the storage of food. It should be well lit and ventilated and close to a water supply. A solid table with a heat resistant top should be provided
- Substances in non-reclosable packaging should be used up (completely) during the course of one experiment, i.e. after opening the package.
FAQ and troubleshooting
To make it easier, you can use the small funnel from the Starter Kit.
You can use either bottled or tap water.
If you can’t find a trace of a copper tree anywhere inside the vial, shake the vial vigorously. Let sit for 30 minutes to an hour. This should help the copper tree grow. If this doesn’t work, repeat the experiment, carefully following the instructions.
No, carefully put the vial in an upright position and leave it for two days. The resulting tree may look slightly different – repeat the experiment and compare your results! We recommend you put the vials in a quiet place where they won’t be touched.
If you want to count, you should add about 30–40 drops of water. You can also try to experiment a little! Add enough water to cover the crystals completely and write down how much water you added. Then wait for the results. If you aren’t satisfied with the outcome, repeat the experiment using a different volume of water. This way, you’ll be able to pinpoint the optimal amount of water yourself!
Prepare some wet copper sulfate CuSO4 crystals. They will act as a source of copper.
Add some table salt NaCl as a separation layer between the copper sulfate and the zinc Zn.
Add a little bit more water to allow the copper from the copper sulfate to creep upwards towards the zinc. Note the change in color.
The copper particles (Cu2+ ions) gradually reach the zinc and take electrons from it, turning into copper Cu metal.
Dispose of solid waste together with household garbage. Pour solutions down the sink. Wash with an excess of water.
Unlike toy bricks or paints, chemical elements do not have predefined colors, and it’s impossible to predict their color by simply looking at the elements’ names. The copper particles (Cu2+ ions) in copper sulfate CuSO4, for example, are surrounded by water molecules H2O . Such a configuration is called a "complex." This Cu2+ complex with water is blue, as you saw at the beginning of the experiment. The chlorine particles—Cl– ions from NaCl—cling more strongly to Cu2+ than the water molecules H2O and replace them easily, forming a new complex of Cu2+ and chloride ions Cl–. The green color you saw, as you've probably guessed, is due to this new complex.
Lastly, when the copper ions Cu2+ meet the zinc Zn, they can grab some of its electrons and turn into copper metal Cu. In this configuration, the Cu2+ ions are surrounded by a cloud of electrons and other Cu2+ ions. The forming metallic copper Cu is, as you can see, reddish-brown.
Curiously, most metals are silvery-white or grey, and only three metals besides copper feature alternative colors. One is, of course, gold Au. The other two are the extremely reactive cesium Cs, which has a bit of a golden tint to it, and the very slightly bluish osmium Os.