Vapor pressure

Saturation vapor pressure is a unique function of temperature as given in Table 5.6. Each temperature in the table may be interpreted as a dew point temperature, because as the ground cools, dew will begin to form at the temperature corresponding to the vapor pressure. Table 5.6: Saturated Vapor Pressure of Air at Various Temperature (C) Temp (F) | Sat Vapor Pressure (mb) | (C) Temp (F) | Sat Vapor Pressure (mb) -18 -15 -12 -09 -07 -04 -01 02 04 07 10 13 16 00 05 10 15 20 25 30 35 40 45

point, vapor pressure, and osmotic pressure are properties that can be manipulated based on the ratio of a solute in a solution compared to the pure solvent. A pure solvent is generally a liquid compound that has the ability to dissolve other materials chemically. Decreased freezing point is the temperature at which the solution or solvent becomes solid, leaving the solute behind. The boiling point is how much it takes for the pressure of the water to become more than the atmospheric pressure or when

Vapor Pressure and Enthalpy of Vaporization of Water 1/9/12 Emily Toy Lab Partner: Zack Ronnei Instructor: Ms. Olsen, AP Chemistry Purpose: The purpose of this lab is to find the vapor pressure of water at temperatures between 50oC and 80oC. Procedure: 1. Take a10 mL graduated cylinder and fill it with 7 mL of water. 2. Next fill a 1000 mL beaker ¾ full with water. 3. Cover the graduated cylinder by putting your finger on top and place the cylinder in the 1000 mL beaker. Make

Part A: Vapor Pressure of a Pure Liquid For experiment 2, I worked with Amiel Angelo. First, I began by calibrating the LabQuest2, while Amiel set up the glassware. Basically, I connected my email to the LabQuest2 and proceeded by plugging in the temperature probe to CH:1 and the pressure sensor into CH:2. Then, I went to the Screen shot 2014-01-15 at 10 page, where I changed the x-axis to “Temperature” and unselected CH1 “Temperature” from graph 2. Once that was completed, I began by going to

relationship between vapor pressure and molar mass and the relationship between vapor pressure and temperature using four alcohols (amyl alcohol, ethanol, methanol, and 2-propanol) to assess whether n-hexanol or an alternative alcohol should be used and how the alcohol should be transported. From the graph trend lines, a negative slope showed that molar mass was inversely proportional to vapor pressure, and a positive slope showed that temperature was directly proportional to vapor pressure. It was concluded

Experiment  2:  Isolation  of  Eugenol  from  Cloves     Background;  Readings  on  Vapor  pressure,  Raoult’s  Law  from  TRO:   A mixture of the essential oils, eugenol and acetyleugenol, will be steam distilled from cloves. These compounds are isolated from aqueous distillate by extraction into dichloromethane. The dichloromethane solution is shaken with aqueous sodium hydroxide, which will react with eugenol, to yield the sodium salt of eugenol in the basic

exhibit essentially the same colligative properties, since each compound dissolves to produce four ions per formula unit. The four commonly studied colligative properties are freezing point depression, boiling point elevation, vapor pressure lowering, and osmotic pressure. Since these properties yield information on the number of solute particles in solution, one can use them to obtain the molecular weight of the solute. Freezing Point Depression The presence of a solute lowers the freezing point

This technique is not applicable to substances that react with water, decompose on prolonged contact with steam or hot water, or have a vapor pressure of less than about 5 torr at 100°C. One way to perform steam distillation is through the live steam method. It is the more widely used method. It is especially used with high molecular weight (low vapor pressure) substances. Although it requires more complex setup, this method reduces bumping. Principles Involved Live steam distillation is

that can be used to separate two volatile liquids in a mixture based on their chemical properties. This is accomplished by fractional distillation, which separates chemicals in a mixture by differentiating them by their boiling points at atmospheric pressure. Specifically in this lab, fractional distillation is used to separate an unknown mixture into its respective pure components. The components are then identified using gas chromatography, which is also telling of the purity of the extracts and success

Colligative Properties & Osmotic Pressure Peter Jeschofnig, Ph.D. Version 42-0149-00-01 Lab RepoRt assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate student’s writing of lab reports by