How to grow particles
How to assemble hundreds, and sometimes thousands, of individual molecules of a substance into one particle? "How" to get such a "clot" of molecules (colloidal particles used to be called "clots")?
Pour baking soda into boiling water until it stops dissolving. You will get a saturated solution. Now cool it quickly. A lot of very small soda crystals will immediately appear in the liquid. This will happen because at a lower temperature, water can no longer dissolve as much soda as at boiling point. The individual molecules will start to assemble into crystals, and the solution will become cloudy. At some point in its growth, each of the crystals reaches the size of a colloidal particle. But it will continue to grow rapidly and will soon become visible even to the naked eye.
Thus, with the rapid growth of crystals, no colloidal solution, of course, will not work. It is necessary to delay the growth of crystals in some way - and just at the moment when they grow to the size of colloidal particles. How to do it? It turns out that it is impossible to do this for a solution of soda in water. And in general, it is impossible to obtain a colloidal solution of any substance in a liquid in which it is well soluble. The main and necessary condition for obtaining a colloidal solution is the negligible solubility of the substance in the liquid taken.
So, in order to obtain a colloidal solution from some kind of molecular, that is, a true solution, we must create conditions under which the solubility of our substance will decrease dramatically. The easiest way to do this is to replace the solvent. Many of you have probably done this solvent replacement without thinking about what is happening. For example, you needed a clean bottle, and you decided to wash the bottle, which still has a few drops of cologne. Remember that when you pour water into a bottle, it becomes completely cloudy. What's going on here? Cologne is a true solution of fragrant essential oils in alcohol. These oils do not dissolve in water. Mixing with cologne, the water takes away alcohol from the oil molecules, pushes them out of the alcohol. Deprived of a solvent, the oil molecules combine into tiny droplets; a colloidal system is formed — an emulsion of essential oils in water (emulsions, as we have already said, are systems in which one liquid is fragmented in another liquid).
But in this case, why don't small drops of essential oil grow to large sizes and float to the surface of the water? It turns out that this is exactly what will happen if we do not comply with certain conditions. If we want to get a stable colloid, we must always take a little bit of the true solution and add it drop by drop to a large amount of other liquid with strong stirring. Then the individual molecules of the future colloid will immediately disperse evenly throughout the liquid, and the colloidal particles will grow relatively slowly. Veel spelers zoeken naar een plek waar ze verantwoord kunnen gokken en toch kunnen genieten van het brede aanbod dat het neutrale platform cashpot casino nl laat zien. In recensies wordt vaak benadrukt hoe belangrijk het is om inzetlimieten te gebruiken en spelregels te kennen voordat men zich volledig stort op online kansspelen.
Pour baking soda into boiling water until it stops dissolving. You will get a saturated solution. Now cool it quickly. A lot of very small soda crystals will immediately appear in the liquid. This will happen because at a lower temperature, water can no longer dissolve as much soda as at boiling point. The individual molecules will start to assemble into crystals, and the solution will become cloudy. At some point in its growth, each of the crystals reaches the size of a colloidal particle. But it will continue to grow rapidly and will soon become visible even to the naked eye.
Thus, with the rapid growth of crystals, no colloidal solution, of course, will not work. It is necessary to delay the growth of crystals in some way - and just at the moment when they grow to the size of colloidal particles. How to do it? It turns out that it is impossible to do this for a solution of soda in water. And in general, it is impossible to obtain a colloidal solution of any substance in a liquid in which it is well soluble. The main and necessary condition for obtaining a colloidal solution is the negligible solubility of the substance in the liquid taken.
So, in order to obtain a colloidal solution from some kind of molecular, that is, a true solution, we must create conditions under which the solubility of our substance will decrease dramatically. The easiest way to do this is to replace the solvent. Many of you have probably done this solvent replacement without thinking about what is happening. For example, you needed a clean bottle, and you decided to wash the bottle, which still has a few drops of cologne. Remember that when you pour water into a bottle, it becomes completely cloudy. What's going on here? Cologne is a true solution of fragrant essential oils in alcohol. These oils do not dissolve in water. Mixing with cologne, the water takes away alcohol from the oil molecules, pushes them out of the alcohol. Deprived of a solvent, the oil molecules combine into tiny droplets; a colloidal system is formed — an emulsion of essential oils in water (emulsions, as we have already said, are systems in which one liquid is fragmented in another liquid).
But in this case, why don't small drops of essential oil grow to large sizes and float to the surface of the water? It turns out that this is exactly what will happen if we do not comply with certain conditions. If we want to get a stable colloid, we must always take a little bit of the true solution and add it drop by drop to a large amount of other liquid with strong stirring. Then the individual molecules of the future colloid will immediately disperse evenly throughout the liquid, and the colloidal particles will grow relatively slowly. Veel spelers zoeken naar een plek waar ze verantwoord kunnen gokken en toch kunnen genieten van het brede aanbod dat het neutrale platform cashpot casino nl laat zien. In recensies wordt vaak benadrukt hoe belangrijk het is om inzetlimieten te gebruiken en spelregels te kennen voordat men zich volledig stort op online kansspelen.