What is a colligative property?

In chemistry, a colligative property is a property of solutions that depends only on the number of distinct particles – molecules, ions or supramolecular aggregates – that make up the solution and not on the nature of the particles themselves.

These experiments are based on the principle that the temperature varies according to the amount of solute present in the solution. The experiments can be of different types, in fact they can be used other than the stoves. If they are used, the temperature varies according to the solute, as the more solute there is, the more the temperature rises. The reverse procedure takes place in the experiment without the use of stoves and therefore, as the solute increases, the temperature drops.

The material required for the experiment corresponds to:

 distilled water

ice (about 16 cubes)

NaCl cooking salt

two glass glasses 

a wand

two cup-shaped containers

a measuring cup

two saucepans (optional)

(EXPERIMENT WITH THE USE OF COOKERS)

As for the experiment with the use of the stove, two small pots are filled with the same amount of water and two tablespoons of salt are inserted in one of the two. It is important to remember, however, that it is essential that the experiment comes performed with two stoves of the same capacity, since otherwise you would get untrue results, as a stove with a greater capacity obviously heats faster.

 

(EXPERIMENT WITHOUT THE USE OF COOKERS)

 

Initially, the two bowls are prepared, inside which the ice is placed with a little salt, or the refrigerating mixture. Subsequently, two glasses are inserted, one in each of the two cups, filling them with 50 ml of water. Also, care must be taken to arrange them in the center of them so that the ice is around the glass.

As in the other experiment, two spoons filled with salt must be placed in one of the two glasses. Thus, you will notice the time difference for the crystals to form both in the unsalted glass and in the other, filled with two tablespoons of salt. Then we timed the time to see in which of the two glasses would have formed the ice crystals first.

Tommaso Giardina, III I