The Effect Of Dissolved Impurities On The Freezing Point Of A Liquid

1596 Words May 17th, 2016 7 Pages
The purpose of this lab is to understand the effect that dissolved impurities will have on the freezing point of a mixture and what additive will affect the the freezing point the most. The freezing point of a liquid is, the point of a substance when the temperature of the solid and the liquid is equal. When water freezes the water molecules become organized and come closer together forming crystal particles of ice.When a solute (like salt) and a solvent (like water) mix together the salt becomes an impurity and makes it so the solution can’t crystallize. This means that the solution remains liquid even when the temperature is lower.
Freezing point depression is when a solution has a lower freezing point than its solvent. This term is the reason in which the salt and water mixture had a low temperature and remained liquid. The freezing point depression can be calculated with this equation:

In the equation, , is the change in temperature of the freezing point (using *C). The freezing point depression for water solutions is (1.86*C/m). The m in the equation represents molality (moles of solvent/ kg of solute). The n in the equation represents how many ions are formed when the solute is displaced. A colligative property is directly dependent on the concentration of a solution. The freezing point depression is an example of a colligative property. This property is the number of solute particles that form when…

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