Question
LABORATORY 81 DETERMINE MOLAR MAss BY BoILING POINT ELEVATION Dissolving a nonvolatile solute in a solvent the pont that by an amount proportional to the quantity of Although this ph enomenon ocours wth any solvent and solute fo reasons of safety and economy we'll use water as the solvent for this session, and sodium chloride (able sa and sucrose (table sugar) as the solutes. PROCEDURE Thalab has three ports in Parti. m11determerethe tor w pont amtiem tripod stand and re 2" of dum chloride and sutrase of PART I: DETERMINE THE uoILING POINT op w ATER NDER AMBIENT PRESSURE The boling point of water unser standard Dndusann istnie of any liquid the actual boane Doint deaenuh the ambient barometric pressure, which and altitudin the barametric pressure sbelow the santhrd rg point of water is than noon: the prowaru than 1000 mbar the ng point of water aanrater than l00'0 Because barometric the actual boins pointo water may differ signncantly from place toplace and from today at SUBSTITuTIONS AND M00IFICATIONS You muy use a kitchen stove burner source, use 2 lange n can id or simlar the burro and Rassware rather than p the ilaksware in direct cor act with 1he bumet CAUTIONS You msy substitune ord nary tabie sugar for Although the chemicals in this eoperimentaw hazardous you be using open and have a fire natirgusher handy Harde the hot quds experiment enth extreme care ryou usea mthe sokutors so that theyll microwave oven to prewar come a boil taster over te acoholumpbecaretulnot Thssalso the reason for special high-altnude baking superheat the solutions.Asuperheated soluton may nstructions. Water boils at a idrwer temperature unpredutaby bol violently eiective hot lqudfrom the lose moesture more quickly, causing them dry out and container Always use abolng chip avoidsuperheatng oolapse. The Canadian Rockes were hgh enough to wear sparuh gogges goves and Protective cloth re cause some baking disasters for me! Chapter sLaboratory Colligatwe properties of soutiens
Explanation / Answer
Elevation in boiling point
1. Colligative properties are dependent upon the type of solute and the amount of solute added to a solvent. Adding different amount of solute to a solvent results in different volumes of solution. So the molarity of a solution varies with respect to both the solute added and the net solution volume. This is why we do not use molarity for calculating colligative properties as we have two varying factors now. On the other hand molality has only the solute changing and thus directly relates to change in physical property, that is colligative property of the solute.
3. Adding ethanol in water to make a solution would result in elevation of boiling point of water. This is the same effect we see for any solute in water which elevates the biling point in the similar fashion.
