freezing point depression lab error Sandoval County New Mexico

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freezing point depression lab error Sandoval County, New Mexico

MATERIALS 600 mL beaker thermometer large test tube 250 mL wide-mouth glass bottle towel wire gauze clamp Bunsen Burner and hose wire stirrer weighing paper ring stand and ring two-hole rubber Generated Sun, 16 Oct 2016 02:03:15 GMT by s_ac15 (squid/3.5.20) Griffiths Why Is Quantum Mechanics So Difficult? How can it be minimized?

LilerIonisation Constants of Inorganic Acids and Bases in Aqueous Solutionby D. Fill the 600 mL nearly full of water and heat till the water temperature is about 85 C. Replace the test tube in the water bath and heat until all the naphthalene has melted. Log in with Facebook Log in with Twitter Your name or email address: Do you already have an account?

If that's true, can you write down the equation relating M (the molality) to MM (the molar mass) using m and s? Attach a thermometer to a size five two-hole rubber stopper with slit by placing it in the slit. In the other hole of the stopper, put a wire stirrer with a What affect does the presence of a nonvolatile solute have upon: the vapor pressure of a solution A nonvolatile solute lowers the vapor pressure. Molar mass isrelevantto this lab because using the freezing point depression and theknowledgeof the number of grams of antifreeze that has been added to the mixture you can calculate the molar

Generated Sun, 16 Oct 2016 02:03:15 GMT by s_ac15 (squid/3.5.20) ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: Connection Using a timepiece and the thermometer measure the room temperature every 30 seconds and record it in Data Table A under "Cooling-Curve data". Supercooling can be minimized by cooling slowly with rapid stirring. The dissolution of a solute with very low vapor pressure, or a nonvolatile solute, raises the boiling point and lowers the freezing point.

Gokul43201, Dec 1, 2006 (Want to reply to this thread? When the naphthalene has solidified, throw both the paper and solid into the designated waste receptacle. Please try the request again. D.

Another scientific concept used in this experiment was that of molar mass. Carefully add the sulfur to the test tube. If you spill any sulfur, make sure you clean it up. This in turn leads to a smaller calculated freezing point depression.

Make sure you do not pour the naphthalene in the sink. The friendliest, high quality science and math community on the planet! Calculate the freezing point of a solution containing 6.50 g of benzene in 160 g of chloroform. Your cache administrator is webmaster.

Close NAME DATE Chemistry 1° Lab 19: Colligative Properties: Freezing-Point Depression and Molar Mass OBJECTIVES To become familiar with colligative properties To be able to use these properties to determine the The molar mass would not be affected because the change in temperature would always be the same. Forums Search Forums Recent Posts Unanswered Threads Videos Search Media New Media Members Notable Members Current Visitors Recent Activity New Profile Posts Insights Search Log in or Sign up Physics Forums Record the mass in Data Table A.

Being that in this solution, the acids do not disassociate, the van’t Hoff factor is one andtherefore is negligible. They are called colligative properties because they are related to the number and energy of collisions between particles and not to what the particles are. After most of the naphthalene is melted, insert the stopper containing the thermometer and stirrer. Make sure the thermometer is not resting or touching the sides of the test tube.

When molecular mass is calculated based on this, the calculated value for the molecular mass of benzoic acid would decrease, because the number of grams present is being divided by alarger number Record the temperature until you have reached the freezing point, or when crystals start to form. Part B Measure about 1.2 g to 1.5 g of sulfur to the nearest Your cache administrator is webmaster. Place a test tube in the clamp.

Newer Than: Search this thread only Search this forum only Display results as threads More... Make sure you have split your 2 hole size 5 rubber stopper Insert a thermometer into the hole that has been slit. Data: Freezing point of distilled water 0C Freezing point of solution 1 -3C Freezing Point of solution 2 -7C Calculations: Conclusion From this lab we can conclude that adding antifreeze to Chemistry: The central science: laboratory experiments, eighth edition.

By not measuring substances accurately, the calculations could be a bit off. Obviously, volatility is a relative term and depends upon temperature and pressure. Thissmaller molality of benzoic acid would then indicate fewer moles of benzoic acid present in thesolution. Log in or Sign up here!) Show Ignored Content Know someone interested in this topic?

No Thanks Don't show this to me again. Record the mass in Data Table A. The physical properties that the solution and solute do not share are known as colligative properties and they depend solely on the solute concentration. Are you sure you want to continue?CANCELOKWe've moved you to where you read on your other device.Get the full title to continueGet the full title to continue reading from where you

Due to the way that the substances were combined in the test tube, one of them was on top of theother, therefore when mixing the two together while melting a homogenous Suppose your thermometer consistently read a temperature 1.2° lower than the correct temperature throughout the experiment. Volatility increases with increasing temperature and decreases with increasing pressure. M'(calc) =M(real) - dM (where dM >0) How do you relate the molality to the molar mass?

These contaminates in the antifreeze could have raised or lower the freezing point depression from what it would have been with pure antifreeze. The three colligative properties are boiling point, freezing point, and vapor pressure. The colligative-property law describes these effects, stating that the "freezing point and boiling point of a solution differ from those of the pure solvent by amounts that are directly proportional to ReutovBooks about AcidA Level Chemistry Quiz: Questions and Answersby Arshad IqbalMCAT Practice Tests: Quiz Questions and Answersby Arshad Iqbal10th Grade Chemistry Quiz: Questions and Answersby Arshad Iqbal Are you sure?This action

Menu Log in or Sign up Contact Us Help About Top Terms and Rules Privacy Policy © 2001-2016 Physics Forums ERROR The requested URL could not be retrieved The following error Freezing point depression is the the lowering of the freezing point of a solution by the addition of another chemical. This smaller molality of benzoicacid would then indicate fewer moles of benzoic acid present in the solution. The system returned: (22) Invalid argument The remote host or network may be down.

Yes, my password is: Forgot your password? I predict that freezing point depression could not be used forsubstancesnotsolublein water, and this is because since the water is not bonded to the substance Ibelieveit will not affect the way A volatile substance ha a high vapor pressure and a nonvolatile substance has a low vapor pressure at room temperature. Thislarger molality of benzoic acid would then indicate more moles of benzoic acid present in thesolution.

If the above guess is correct (please confirm whether they are), then, as you said, the real molality will be greater than the calculated molality, due to solvent on the walls. Stay logged in Physics Forums - The Fusion of Science and Community Forums > Science Education > Homework and Coursework Questions > Biology, Chemistry and Earth Homework > Menu Forums Featured What is the molar mass of this substance? D T = 6.6șC - 1.05C = 5.55ș = 5.6șC D T = 5.6șC = (20.4C/molal) x x = .27 molal .27