Answer to using freezing point depression to find molecular weight mass of lauric acid (g) 8003 mass of benzoic acid (g) 1010 fr. View lab report - lauric acid from chm 113 at university of miami the determination of the freezing point of lauric acid purpose the intention of this experiment was to quantitatively calculate the freezing point depression lauric acid. Using freezing-point depression to find molecular weight to determine the freezing point of the benzoic acid-lauric acid solution, you need to determine the temperature at which the mixture first started to freeze unlike pure lauric acid, cooling a. Students will calculate the freezing-point depression as the t between the freezing temperature of pure lauric acid and that of the lauric acid-benzoic acid solution. Jonathan khan ms crowley may 15, 2011 using freezing-point depression to find molecular weight lab 1 one possible source of error is not stirring the mixture of lauric and benzoic acids as they are being melted.
Using freezing-point depression to find molecular weight chemistry with computers 15 - 3 part ii freezing temperature of a solution of benzoic acid and lauric acid. There are four common colligative properties including vapor pressure lowering, boiling point elevation, freezing point depression determine the freezing points for both pure lauric acid and the lauric acid/unknown chemical mixture from the freezing point graphs. The radiator fluid in an automobile is a mixture of water and ethylene glycol as a result of freezing-point depression a beckmann freezing apparatus freezing-point depression can also be used as a 587 k & k lauric acid 2989 44 -39 acetic acid 1179 307 166 -3. List of boiling and freezing information of solvents k b ( c kg/mol) freezing point ( c) k f ( c kg/mol) data source aniline: 1843: 369 -596 -587: k b & k f: lauric acid: 2989: 44 -39: acetic acid: 1179: 307: 166 -390: k b freezing-point depression boiling-point. Lauric acid | c12h24o2 | cid pressure when considered as the temperature of the reverse change, from liquid to solid, it is referred to as the freezing point 111 f (ntp, 1992 palmitic, myristic acids signs of toxicity included slight depression, depressed righting and. Problem using freezing point depression to find molecular weight mass of lauric acid (g) 8003.
Part i freezing temperature of pure lauric acid 3 add about 300 ml of tap water to a 400 ml beaker place the beaker on a hot plate on the using freezing-point depression to find molecular weight chemistry with computers 15 - 3 12. Hello, i was wondering what the freezing and melting points are for lauric acid, and also why the melting point is higher than the freezing point help me out. To calculate molar mass of a solute from freezing point depression 2 to generate a cooling curve for a typical solution preparation 1 in this lab that they used in the pure lauric acid for heating and cooling. Determination of molar mass by freezing point depression in this experiment you will determine the molar mass of an unknown by determining the freezing point depression of the solvent, lauric acid, by adding the solute, the unknown stockroom.
The formula and the molecular weight of an unknown hydrocarbon compound are to be determined by elemental analysis and the freezing-point depression method (a) that the freezing point of the lauric acid was lowered by 168 c the value of k f of lauric acid is 390 c m. Start studying chm 113 freezing point depression: lauric acid learn vocabulary, terms, and more with flashcards, games, and other study tools. 1 the k f value for lauric acid is 39 c kg/mol use the freezing point depression equation to determine the molality, m, of the lauric acid in the test tube containing the mixture.
Answer to 1 what is the freezing point depression of the benzoic/lauric acid solution 2 what is the molal concentration of benz. Problem #11: when 200 grams of an unknown nonelectrolyte compound are dissolved in 5000 grams of benzene, the freezing point of the resulting solution is 377 c. Greening freezing point depression lab another common high school experiment is to observe the way naphthalene depresses the freezing point of pure lauric acid this was the lab used by mr edward auclair, a chemistry teacher at bishop guertin high school. Study experiment 8: freeing point depression of lauric acid flashcards online, or in brainscape's iphone or android app learn faster with spaced repetition. Information about lauric acid, one of the chemicals distributed and supplied by seidler chemical lauric acid is commonly used to investigate the molar mass of an unknown substance by way of the freezing-point depression lauric acid is useful because its melting point when pure is rather.