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In the video, the presenter discusses how to calculate the concentration of a solution in three different ways: absoluto, disolvente, and gramos por litro (g/L, % in mass and % in volume). They demonstrate how to calculate the concentration of a sugar solution at three different volumes, and explain that the concentration in grams per liter is determined by the mass and volume of the solute.

**00:00:00**In this video, chemistry teacher discusses concentration, with particular focus on the concentration of a solution. Three ways to express concentration are described, as well as the meaning of each: absoluto (most concentrated), disolvente (most diluted), and gramos por litro (g/L, % in mass and % in volume). An expression for concentration in grams per liter is also given, as well as a formula for calculating it based on the mass and volume of the solute. Next, a technician prepares a solution by dissolving 10 grams of sugar in 200 milliliters of water. They ask the teacher to calculate the concentration of the solution in grams per liter. The teacher writes "g/L, % in mass and % in volume" next to the sugar concentration and explains that this means the sugar is dissolved at a rate of 100 g/L in the 200 milliliters of water. Then, they ask the teacher to calculate the concentration of the sugar in grams per liter at three different volumes: 100 milliliters, 200 milliliters, and 300 milliliters. The teacher writes "g/L, % in mass and % in volume" next to the sugar concentration at each volume and explains that this means the sugar**00:05:00**The title of the video is "Cálculo de Concentraciones (g/L, % en masa y % en volumen)." The video explains how to calculate the concentration of a solution, and in this case, how to calculate the concentration of an acidic chloride solution that has 10 grams of solute and yields 90 grams of water. Care must be taken to avoid confusion between the mass of the solvent and the mass of the solution. The visual mass of the solvent is 90 grams because I said "cuidadito"--careful because they are giving me the mass of the solvent, not the mass of the solution. The concentration of the solution can be calculated by dividing the mass of the solution (100 grams) by the mass of the solvent (90 grams). The percentage in mass is equal to the percentage in volume multiplied by 100. The percentage in volume can be calculated by multiplying the mass of the solution (100 grams) by the mass of the solvent (90 grams) and then dividing that product by 1000. The solution would be written as 10 g/L and the chloride solution would be 90 g/L so the concentration would be 9.9 g/L. The video then goes on to do the same calculation for**00:10:00**In this video, the concentration of a liquid in a container is calculated using math. If you're having any doubts about the calculations, don't hesitate to contact the video's presenter via email or through their Twitter account.

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