Introduction Colligative properties are physical properties of a solution that c

Question

Introduction Colligative properties are physical properties of a solution that can change depending on the amount, not identity, of particles dissolved in a solvent. These properties include freezing point depression, boiling point elevation, osmotic pressure and vapor pressure lowering. These properties can be explained by the idea that a solution will contain fewer solvent particles on its surface than the pure solvent, resulting in fewer solvent molecules being able to escape and enter the gas phase. Because colligative properties depend on the number of particles dissolved in solution and not the type, nonelectrolytes and electrolytes must be treated differently. When the one mole of the nonelectrolyte ethylene glycol dissolves in water only one mole of solute particles are generated. However, when one mole of potassium sulfate dissolves in water two moles of K' and one mole of SO ions are formed, resulting in three moles of particles dissolved in water. It would be expected that potassium sulfate should have three times the effect on the colligative properties of water than ethylene glycol. The volume of a solution changes with temperature resulting in a change in the molarity of a solution. To overcome this concentration temperature dependence, the mathematical relationships to describe colligative properties use molality as the concentration. Molality is the moles of solute particles per kilogram mass of solvent. Molality is therefore independent of volume of the solution. In this laboratory you will investigate the effect several different solutes have on the freezing point of aqueous solutions

Explanation / Answer

Purpose:
To study the effect of solute on freezing point of water. There is depression in freezing point when some solutes areadded to it that is freezing point of water decreases when solute is added to it.

Introduction:
There is depression in freezing point when some solutes areadded to it that is freezing point of water decreases when solute is added to it. Water freezes at lower temperature than its normal boiling point.
To study this depression phenomena, prepare a solution of water and solute that needs to be studied. After making the solution, add some ice in it. When there is no temperature change, it means that ice is melting. Record this temperature. It ismelting point of Ice.
Generally ice melts as 0 degree celsius but this temperature will be less than 0 degree celsius

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.