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Enthalapy Lab

# Enthalapy Lab - N ia Patterson Professor Gray Chemistry 120...

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Nia Patterson Professor Gray Chemistry 120 Lab – Section 3 February 14, 2011 Lab 5 – Stoichiometry of Ionic Hydrates I. Pre-lab Questions - The nature of an ideal gas is one that follows the ideal gas law (PV=nRT). For a majority of gases, when they are at or above room temperature and near or below room pressure the ideal gas law applies to their behavior. - The conditions for STP differ between three main standards. The International Union of Pure and Applied Chemistry (IUPAC) standard is a temperature of 0 °C (273.15 K, 32 °F) and an absolute pressure of 100 kPa (14.504 psi, 0.986 atm). The National Institute of Standards and Technology (NIST) version is a temperature of 20 °C (293.15 K, 68 °F) and an absolute pressure of 101.325 kPa (14.696 psi, 1 atm). Lastly, the International Standard Metric Conditions for natural gas and similar fluids is 288.15 Kelvin and 101.325 kPa. 1 - Pressure = P (This is measured in atmospheres – atm) Volume = V (This is measured in liters – L) Amount or/ Weight = mol (this is measured in moles – mol) Temperature = T (This is measured in Kelvins – K) II. Beginning Questions and Ideas - In this lab, we will hope to decide whether gases generated in a laboratory still behave like ideal gases. We will be able to find the molar volume of a pure gas and verify how well the ideal gas law for experiments applies under laboratory conditions. III. Tests and Procedures - Goal 1. The goal is to determine the molar volume of a pure gas and certify the applicability of the ideal gas law for experiments under typical laboratory conditions - Procedure 1. Put on goggles and gloves. 2. Obtain a strip of Magnesium (Mg), sand it on all sides with a piece of sand paper, and weight it so that it is about 8mg. 1 "Standard Conditions for Temperature and Pressure." Wikipedia, the Free Encyclopedia . 29 Jan. 2011. Web. 01 Mar. 2011. <http://en.wikipedia.org/wiki/Standard_conditions_for_temperature_and_pressure>.

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3. Fill a beaker large enough to hold the graduated cylinder with water (fill it with ice and cold water for the trial involving 0 O C water). 4. Fill a graduated cylinder with 10mL of water (should be cold water for the 0 O C trial). SKETCH 5. Add to graduated cylinder 1-2mL of HCl. Do this inside the fume hood. 6. Stick the Mg strip in the bottom of a rubber cork. SKETCH 7. Quickly cork the graduated cylinder and place a finger over the hole in the top of the cork. 8. Place the graduated cylinder inverted inside a separate beaker filled with water. Remove finger once the graduated cylinder is submerged. SKETCH 9. Let the graduated cylinder stay inverted in the beaker for 10 minutes to allow the reaction to fully occur. 10.
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Enthalapy Lab - N ia Patterson Professor Gray Chemistry 120...

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