the freezing point depression of a known amount in an aqueous solution. Freezing point depression is a colligative property of solutions. There are three other properties‚ which are boiling point elevation‚ vapor pressure depression‚ and osmotic pressure. Colligative properties of a solution depend on the amount of solute and solvent molecules and not the specific properties of the molecules. The temperature at which the solvent starts to freeze will be specified as the freezing point of the solution
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Using Freezing-Point Depression to Find Molecular Weight Abstract: In this lab‚ the purpose was to use the freezing point depression method to determine the molecular weight of aspirin. This was done by determining the freezing of t-butanol and that of a t-butanol and aspirin solution; then finding the molality of the solution‚ and moles of aspirin. In the results of the experiment‚ the molar mass was found to be 192.2 g/mol‚ which differed from the established value of 180.2 g/mol by 6.7% error
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Spectroscopy‚ Boiling point and Melting point. Introduction: - Infrared spectroscopy has also made a break though in medicine. It used to evaluate the kidney stone diseases thus broadening the use of IR in different ways. The purpose of this lab experiment is to identify the unknown solutions using the Infrared Spectroscopy (IR)‚ boiling point‚ and melting point (1). The IR helps to determine the compounds such as a functional group. In order to analyze the compound‚ IR and melting point work the best together
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Freezing Point Depression Purpose: The purpose of this lab is to demonstrate freezing point depression by dissolving salt into two liquids and monitoring temperature. Materials: test tube‚ Thermometer‚ 10 mL graduated cylinder‚ 2 micropipettes‚ Styrofoam cups‚ 4 pieces plastic wrap‚ 70% ethyl rubbing alcohol‚ 91% isopropyl rubbing alcohol‚ ice‚ distilled water‚ rock salt Procedure: Using the graduated cylinder‚ measure 2 mL of alcohol and pour it into the test tube. Add 10 mL of
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Purpose: a) Determine the melting points of two organic compounds known to have the same melting range when pure. b) Determine the mixture melting point of a mixture of the two pure compounds. c) Identify an unknown organic compound by determining its melting point and mixture melting point. Procedure and Observations: Using the procedure outlined in Appendix A of the Lab Manual‚ approximately equal samples of p-Nitrophenol and acetanilide‚ which are known to have the same melting range
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Results My unknown sample was number 18. I did three melting point trials‚ which resulted in a melting point range of approximately 120°C to 122°C‚ as shown in Table 1. I also did two mixed melting point trials using Benzoic Acid and Succinimide‚ as shown in Table 2. Percent recovery is 28.26 grams. Table 1: Unknown Melting Point Trials Trial Melting Point 1 120°C – 122°C 2 120°C – 122°C 3 119°C - 122°C Table 2: Mixed Melting Point Trials Trial Benzoic Acid MP Unknown #18 MP Succinimide MP
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Exploring Boiling Points Introduction: Every substance has a unique set of properties that allow us to differentiate between them. These properties are classified as physical properties and chemical properties. Physical properties are those that can be determined or measured without changing the composition or identity of the substance. These properties include color‚ odor‚ taste‚ density‚ melting point‚ boiling point‚ conductivity‚ and hardness. Chemical properties tell us how the substance
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Raghed Odeh Chem 227 11/01/2017 Using Conductivity to Find an Equivalence Point Provide a brief statement of the purpose of this activity. Be sure to define equivalence point. Explain conductivity and the idea behind why conductivity can be used in determining the equivalence point in a titration. The purpose of this experiment was to use the conductivity to find the equivalence point. The equivalence point is the point in a titration where the amount of titrant added is enough to completely neutralize
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10/17/11 OUTLINE FOR REPORT ON EXP V: CHLORIDE ISE (50 points max.) I. Purpose: Use one or two complete sentences to give a concise statement of the purpose of the experiment. Experimental Parameters: Theoretical Equations: Give the theoretical equations which relate the potential of the ISE/SCE pair to the activity of chloride and the concentration of chloride. What must be true if the latter equation is to be valid? What is the ideal slope of a plot of potential versus the logarithm of the concentration
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three times from each height‚ found the mean. Our Y value represents the average bounce heights in centimeters and X represents the drop height in centimeters. We created a scatter plot to show our data (below). The line of best fit went through the points (80‚48.3) and (90‚54.3). To find the slope of the line we used the slope formula: M=(Y2 -- Y1)/(X2 -- X1). If (80‚48.3) is X1 and Y1 then (90‚54.3) is X2 and Y2. After this you take X2 and subtract it by X1 and the same with Y1 and Y2. So 90-80 is
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