Besides naphthalene, the other substance that is suitable for heating by the water bath is acetamide conclusion: the melting point and the freezing point of naphthalene is 80 ºc. Freezing point depression the purpose of this lab is to determine how much the freezing point of a pure substance changes when impurities are added we will first determine the freezing point of pure naphthalene (c 8 h 10 ), then add a small amount of p-dichlorobenzene (c 6 h 4 cl 2 ) and determine the new freezing point. Freezing point of naphthalene i purpose to determine the freezing point of a known substance, naphthalene ii materials ringstand gas source test tube test tube clamps thermometer naphthalene bunsen burner goggles hose stopwatch iii procedure 1 assemble the bunsen burner, attaching one end of the hose to the burner and the.
Thus, the molal freezing point depression constant of naphthalene is 769 °c / m discussion: freezing point depression is the phenomenon that the freezing point of pure substance falls to lower temperature due to the existence of other impurities. Problem #19: calculate the freezing point of a solution of 500 g of diphenyl c 12 h 10 and 750 g of naphthalene, c 10 h 8 dissolved in 2000 g of benzene (fp = 55 °c) solution there is a tiny curve in this problem, but keep in mind that colligative properties are all about how many particles in. The freezing point of naphthalene with a known compound (biphenyl), will also be measured since this allows the calculation of the molal freezing point depression constant k f of the solvent the molality of a solution is defined as the number of moles of solute in one kilogram of solvent,. Example #1: calculate the freezing point of a solution of 500 g of diphenyl c12h10 and 750 g of naphthalene, c10h8 dissolved in 2000 g of benzene (fp = 55 °c) solution there is a tiny curve in this problem, but keep in mind that colligative properties are all about how many particles in solution and nothing else.
Melting and freezing points of naphthalene experiment what is meant by the kinetic theory of matter march 21, 2017 by sastry leave a comment what is meant by the kinetic theory of matter the kinetic theory of matter: the arrangement and movement of particles in solids, liquids and gases are described in the kinetic theory of matter the. From the results obtained in the experiment, it obeys the theory of freezing point depression stating that the solution which contains naphthalene and substance x will have lower freezing point compared to the freezing point which contains only pure solvent (naphthalene. Problem #4: what is the freezing point depression when 622 g of toluene (c 7 h 8) is dissolved in 481 g of naphthalene the freezing point constant for naphthalene is 700 °c/m the freezing point constant for naphthalene is 700 °c/m. Lab 7 - determination of the molar mass of an unknown solid by freezing point depression goal and overview in the first part of the lab, a series of solutions will be made in order to determine the freezing point depression constant, k f, for cyclohexanethe freezing points of these solutions, which will contain known amounts of p-dichlorobenzene dissolved in cyclohexane, will be measured. Freezing point of naphthalene according to your data and graph, what is the freezing temperature of naphthalene (moth ball flakes), the melting temperature express your answers to the nearest 01°c.
The melting point of napthalene can be determined by stuffing some into a capillary tube, strapping a thermometer to it, and immersing it a hot bath. The freezing point of a solution calculate freezing point of solution freezing point of benzene solution = 55ºc – 269ºc = 281ºc that means after naphthalene is added to benzene, benzene freezes at a much lower temperature naphthalene is a chemical used for making commercial products such as lubricant, insecticide,. Solvent k f (°c kg/mol) mpt (°c k b (°c kg/mol) bpt (°c) 2,2-dimethyl-1-propanol: 110: 53 : 113: dimethyl sulfoxide: 407: 19 : 189: 1,4-dioxane: 463: 12: 3270.
Structure, properties, spectra, suppliers and links for: naphthalene, 91-20-3. A solution prepared by dissolving 153 g of an unknown compound in 560 g of naphthalene has a freezing point which is 101 o c lower than the freezing point of pure naphthalene the freezing-point depression constant for naphthalene is 690 o c/m. Problem: 160 g of naphthalene (c 10 h 8) is dissolved in 200 g of benzenethe freezing point of pure benzene is 55 o c, and the freezing point of the mixture is 28 o c what is the molal freezing point depression constant, k f of benzene strategy: step 1: calculate the freezing point depression. Molal freezing point depression constants calculating k f values introduction the freezing point of a liquid is the temperature at which the forces of attraction among molecules are just enough to cause a phase change from the liquid state to the solid state it is the temperature at which the liquid and solid phases exist in equilib. The freezing point of naphthalene will be determined experimentally then a controlled solution of naphthalene and sulfur will be made, and the freezing point of that solution will be determined the difference in freezing point can be used in the colligative property law to determine the experimental molality of the solution, leading to a.
Best answer: chloroform is the solvent, napthalene is the solute the freezing poing of pure chloroform = -635c chcl3 = 11935 245moles x 11935g/mole = 29241g or 0292kg deltat = kf chloroform x molality. The west point cheating scandal essay - the west point cheating scandal description: in april of 1976 it was found that there was a possibility that over half of the junior class at west point academy had violated the west point honor code by cheating on a case assignment. What is the freezing point of a solution containing 4134 grams naphthalene (molar mass= 1282) dissolved in 300 grams paradichlorobenzene the freezing point of pure paradichlorobenzene is 530c and the freezing point depressing constant kf is -710c/m.
The freezing point of paradichlorobenzene is 127 degrees fahrenheit at standard pressure paradichlorobenzene is used in agriculture to eradicate mold in. Data logger: melting and freezing points of naphthalene 1 melting point and freezing point of naphthalene ssi 3013 information and communication technology in science name: matric no: chan su fang d 20101037450 chang p xian ei d 20101037455 rochelle t ang nga ning d 20101037537 group :a lecturer : e azmi ibrahim n. Naphthalene has the chemical formula c10h8 it is the simplestaromatic hydrocarbon and has a melting point of 1765 degreesfahrenheit or 8026 degrees celsius.