Part A.3. Some of the cyclohexane solvent vaporized during the temperature versus time measurement. Will this loss of cyclohexane result in its freezing point being recorded as too high‚ too low‚ or unaffected? Explain. -The freezing point will be higher because the loss of solvent means that the molarity of solute is too high. The melting point will be lower than expected. 5. Part B.2. The solute dissociates slightly in the solvent. How will the slight dissociation affect the reported molar mass
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temperature be raised when determining a melting point? When can the temperature be raised more quickly? 2) If there is an Impurity present in a sample‚ what is the effect on the melting point? 3) Explain why a) salt‚ spread on roads in the winter‚ helps prevent icing in‚ for instance‚ southern Ontario‚ and b) salt is useless on the much colder roads of Manitoba. 1) You would have to slowly raise the temperature up when determining the melting point due to the sensitivity of the dulcin being
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Preparation of Dibenzalacetone by the Aldol condensation David o Neill Date of experiment: 14/12/2011 Apparatus Steam bath‚ ice bath‚ Buchner funnel‚ beaker‚ conical flask‚ filter paper‚ TLC apparatus‚ Melting point apparatus Materials / chemicals Benzaldehyde‚ acetone‚ ethanolic sodium hydroxide‚ ethanol Introduction The synthesis of dibenzalacetone is formed from an Aldol condensation reaction. An Aldol condensation reaction is a very effective way of forming a carbon – carbon bond reaction‚ in
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drug. The identity of the drug was determined through melting point‚ percent recover‚ and Rf values. The comparable data for acetaminophen from the manufacturer is 500mg of active ingredient. After conducting the experiment-extraction‚ distillation‚ and evaporation- 451mg of active ingredient. This relates to a 68.1% recovery. The melting point was between 158 and 165 degrees Celsius‚ which is almost ten degrees lower than the published melting point of acetaminophen. After conducting a TLC plate‚ the
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Melting Ice * Salt is routinely used to make icy roads and sidewalks safe in the winter. As soon as the salt comes in contact with the ice‚ the surface of the ice starts to melt. This only works‚ however‚ if the temperature outside is at or near freezing. If it is too cold outside‚ the ice itself becomes very dry and salt is not as effective in melting it. Salt Reduces Freezing Temperature of Water * Salt works by lowering the freezing temperature of water. Salt water needs to reach a colder
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recrystallized to form a solid‚ clear‚ crystal- like product. The melting was taken from the recrystallized product to determine what had been obtained. The melting point was found to be 130.5°C-133.7°C. Concluding that the product formed from the addition of bromine was a mixture of the erythro-2‚ 3-dibromo-3-phenylpropanoic acid‚ which has a known melting point of 204°C‚ and threo-2‚3-dibromo-3-phenylpropanoic acid‚ which has a known melting point of 95°C. Meaning the recrystallized product was a racemic
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Practical 5: Properties of Compound Experiment 1: Properties of A Compound and Its Parent Elements Hypothesis The hypothesis of this experiment is magnesium oxide can be synthesized by combining (burning) the magnesium with oxygen. The chemical and physical properties of each element (magnesium‚ oxygen‚ and magnesium oxide) might be different‚ from the state‚ color‚ electrical conductivity‚ and pH. Aim This experiment was performed to synthesize magnesium oxide by direct combination of
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98075 Dear Mrs. Sylva‚ After days of research‚ I have come upon one of the substances that will be the ideal compound for the glaze. I conducted a test to analyze the solubility of the substance in water and alcohol‚ the conductivity‚ and melting point. Some substances came very close to passing all the tests‚ but only one substance was able to pass all of them. I recommend using sodium carbonate as your substance. Of all the substances‚ only two were covalent and two were ionic. The ionic
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lower the freezing point of water. For the ice cream maker‚ because the rock salt lowers the freezing point of the ice‚ the temperature of the ice/rock salt mixture can go below the normal freezing point of water. This makes it possible to freeze the ice cream mixture in the inner container of the ice cream machine. For the salt spread on streets in wintertime‚ the lowered freezing point means that snow and ice can melt even when the weather is below the normal freezing point of water. Both the
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OBJECTIVES: 1. to investigate the heating process for solid dodecanoic acid 2. to investigate the cooling process for liquid dodecanoic acid 3. to determine and compare the melting and freezing points of dodecanoic acid SUPPLIES: Equipment ring stand buret clamp hot plate test tube (18mm * 150 mm) assembly (half full with solid dodecanoic acid with thermometer embedded) beaker (400 mL) thermometer for water bath lab apron safety goggles Chemical Reagents dodecanoic acid‚ C11H23COOH
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