Solubility Lab

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Panorea Kontis Michael Laplaine-Pereira Lab Exercise 1 Solubility of a Salt Mauro Di Renzo Lab took place on 01/09/2014 Lab report submitted on 15/09/2014 Abstract The solubility of a salt is the maximum amount of salt will dissolve in a given amount of solvent. Since solubility changes with temperature of the solvent, it is therefore described by the amount of solute per solvent at a given temperature. In this experiment, the solubility of potassium nitrate (KNO3) is studied by heating and cooling the solution and recording the temperature at which the solute precipitates in the solution. Additionally, water will be added between each trial to observe different solubilities and to record their saturation temperatures. The experiment…show more content…
The solubility of the salt at two different temperatures (20°C and 35°C) must then be determined using the graph. Theory: Solubility can be defined as the concentration of a solution when it has reached saturation. At the solubility limit, any amount of additional solute added to a solution will be insoluble. In this lab, solubility will be measured by using molality (1), which is the number of moles of solute (salt) per kilograms of solvent (water). (1) Molality (m) = nsolute/msolvent Solubility varies with temperature. At a higher temperature, the solubility rises. This is because there is more space between the molecules of solvent, which means that there is more space for solute to be dissolved. At a lower temperature, the water becomes denser, so the molecules are closer together. This means that there is a lower amount of solute than can be…show more content…
Additionally the solution will expand in volume with the increase in temperature make it more “easier” for the solute and the solvent to combine. Another observation is that the less the solution is concentrated the more soluble it since its saturation temperature went up. It feels like there is more “options” for the molecules of salt to combine with water making it easier for it to

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