"Xmas tree" from the "Chemistry of winter" set скачать в хорошем качестве

"Xmas tree" from the "Chemistry of winter" set

Perform this amazing experiment at home with MEL Science: https://melscience.com/en/experiments... Safety Put on protective gloves and eyewear. Conduct the experiment on the tray. Observe safety precautions when working with boiling water. Disposal Dispose of solid waste together with household garbage. Pour solutions down the sink. Wash with an excess of water. Step-by-step instructions 1. Only a limited amount of sodium chloride NaCl can dissolve in water. To start, let’s add a larger quantity of sodium chloride than will dissolve in a vial of water. Add some potassium ferrocyanide K₄[Fe(CN)₆] so the Christmas tree looks furrier. 2. Temperature greatly affects the amount of sodium chloride that can dissolve in water. We will be able to dissolve most of the salt in the vial if we heat the mixture. 3. The solution will not readily coat the surface of the Petri dish. In order to make it spread evenly across the bottom, add one drop of a surface-active agent—soap. 4. Now put the paper Christmas tree into the solution. Paper is a porous material, so the solution will easily rise and spread through the Christmas tree due to the capillary effect. 5. The solution on the Christmas tree and the leftovers in the Petri dish will cool down quickly. The solubility of the salt will decrease, and the salt will start to form crystals again. Moreover, the water will gradually evaporate, and less salt will be able to stay dissolved in the remaining liquid water. As a result, all the salt will gradually settle on the Christmas tree in the form of white crystals. The addition of potassium ferrocyanide will make the crystals more graceful, and the Christmas tree fluffier.