Freezing-point depression

Finding Molar Mass of an Unknown Compound using Freezing Point Depression Farida Elassar*, Pranav Menon Introduction: Certain species of animals and fish survive the cold by increasing the concentration of solutes in their blood to lower its freezing point. In this experiment, we will be measuring the freezing point depression of the aqueous solutions of an unknown compound to ascertain the unknown’s molar mass and therefore its identity. Method: Firstly, the experimental apparatus was set up by

Freezing Pt Depression Lab Purpose- To predict compare the actual and theoretical van’t Hoff Factors for three compounds via freezing point depression Day 1 Procedure Fill a beaker ¾ full with ice from the freezer and add ¼ to ½ inch of table salt. Stir until mixed and check that the temperature is ~≤ -8 ºC. Fill a test tube ½ full with tap water Put the temp probe in the test tube and immerse the test tube in the ice-salt bath. Stir the water in the test tube gently with a thermometer while

Biology 1 4 November 2014 Freezing point depression The freezing point depression is included in four properties of solutions, collectively called the Colligative Properties. The four properties included in the Colligative Properties are vapor pressure, boiling point, freezing point, and osmotic pressure. Now, whenever a substance is added and dissolved into a solvent, there is a decrease in vapor pressure. This results in a change of the solvents boiling point, freezing point, and osmotic pressure

of this lab was to explore the colligative properties, in this case freezing point and freezing point depression, of the solvent p-xylene. The freezing point of p-xylene was obtained using the MicroLab program and a thermistor temperature sensor. From this data, the freezing point depression constant, kf, could be found, as well as identifying three unknown solutes by calculating their molar masses. Knowing the freezing point, or the temperature at which crystalline solid and liquid can coexist

to be determining the freezing point depression constant of water. Through the use of solutions with different concentrations one will find that the solution with the highest concentration will have the lowest freezing point. This is true because this solution has more particles in it, in comparison to the solutions with fewer particles, and therefore has to take longer to slow each of these particles down in order that they might be frozen. In order to find the freezing point of a solution a very

objectives in this laboratory were to be able to calculate the freezing point depression among three trials of unknowns, be able to correctly measure the freezing points of p-xylene, and to be able to calculate the molar masses of the unknowns by found freezing point depression values. This was done to be able to understand and apply a concept names supercooling. Supercooling is when a liquid is put far under its original freezing point and remains a liquid or gas. This happens when a substance is

The purpose of this lab was to determine the molecular mass of a compound by measuring the freezing point depression. Freezing point depression is one concept discussed within this experiment, additionally, in class too. Freezing point depression is a colligative property, which refers to one that depends on the number of particles in a given volume of solvent, rather than on the chemical nature of the particles. Another concept applied to this experiment is the cooling curves, which for a pure solution

The freezing point of a substance is when the substance turns from a liquid to a solid. The freezing point of a solvent can be decreased by adding a solute and making a solution, which is a freezing point depression. From knowing the temperature difference between a pure solvent and a mixture, it is possible to find the molar mass of the solute. To begin the experiment, students first obtain a LabQuest with a temperature probe. First, you retrieve about 20gs of t-butyl alcohol and put it in a pre-massed

Aman Freezing Point Depression Measurements Purpose: The purpose of the experiment was to determine the molar mass of three unknown solutes by measuring the freezing point depression of a solution containing each of the unknowns. When a solute is dissolved in a solvent, the vapor pressure of the solvent is lowered. As a result of the decrease in the vapor pressure, the colligative properties change. Colligative properties include vapor pressure lowering, boiling point elevation, freezing point depression

is to use Freezing Point Depression by using the following equation: ΔT= kf*m (Robinson, 2018). The purpose of this lab was to do just that; measure the freezing point depression of a solution when a solute is added to a solvent, and from that, determine the molar mass of an unknown substance, along with learning about the influence that solutes have on liquid properties. A concept of importance to this experiment is freezing point. According to LibreTexts, “Freezing point depression is a colligative