Oct10

Scientific experiment for high school students: variation of water density

Density is the result of dividing mass by volume. This homemade experiment, will serve to demonstrate the density in liquids and to develop scientific research capacities among students. Through this experiment they will be able to understand the variation of water density by adding a solute. 

The experiment: For this experiment you will need, ½ kilogram of sodium chloride or common salt used in the kitchen, colorant, 1 liter of water, 7 transparent glasses, 1 teaspoon, a pipette or a dropper, a balance and a thermometer. First, add water to the third part or half of the glass and then add salt to each glass using different colorants in each of one. It is necessary to control the amount of salt in each teaspoon and the amount of water in each glass. To do this you have to measure both the mass of the salt of each teaspoon and the same will be done with the volumen of the water. The amount of water used depends on the size of the containers to be used. It is also important to monitor the temperature in each of the samples. Thus, in the first glass is not added salt, in the second glass a teaspoon, in the third glass two teaspoons, in the fourth glass three and so on. After that, with a pipette or if you don't have with a dropper take about 30 ml of water from the glass that has 5 teaspoons of salt and place it in an empty glass. Then add another 30 ml of water containing 4 teaspoons of salt and so on with each of the water samples. Therefore, we can deduce that the variation of density in water is directly proportional to the mass quantity of the solute that is added (sodium chloride or common salt). Hence, we can affirm that the more solute we add to the water, the greater will be the density. Source: https://www.experimentosfaciles.com/experimento-cientifico-para-secundaria-variacion-de-la-densidad-del-agua/  
Anabel
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