Done By: Joza Aldossary ( ) Noorah Alsulaim ( )

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Presentation transcript:

Done By: Joza Aldossary ( 200700686) Noorah Alsulaim (200900099) EXPERIMENT # 14 Application Of Gas Laws: Determination Of The Universal Gas Constant (R) Done By: Joza Aldossary ( 200700686) Noorah Alsulaim (200900099)

The Objective Of The Experiment: The objectives of this lab are: A) To experimentally determine the value of the gas constant (R). B) To experimentally determine the volume of one mole of a gas at standard temperature and pressure.

The Materials Used In The Experiment: 1- 800 Ml Beaker. 2- Burette. 3- Thermometer. 4- Pipette. 5- Hydrochloric Acid. 6- Magnesium Ribbon. 7- Water. 8- Distilled Water.

The Procedure Of The Experiment 1- Get a small strip of Magnesium ribbon and weight it by the electric balance. ( Mass = 0.025 g ) 2- Fill the 800 ml beaker with water to the top.

3- By Pipette, take 10 ml of acid and add it to the burette. 4- Add distilled water to the burette until is full.

5- Now fold the Mg strip in the middle of the burette.

6- Place your finger on the top of the burette 6- Place your finger on the top of the burette. Turn the burette inside water. Now remove your finger. VIDEO #1

7- Now the reaction between acid and Mg strip will start 7- Now the reaction between acid and Mg strip will start. The bubble will flow from down to up as it shown in the video. VIDEO #2

8- After the reaction complete, read The final level of the water = 3.5 (ML) The temperature= 19 (Celsius) 9- From the vapor pressure of water table in page# 118, pick the vapor pressure of water depend on the temperature (torr). The vapor pressure of water = 16.5 torr

Calculations: 10- From the Periodic Table find the molar mass of mg. The molar mass of mg= 24.3050 moles. 11- Moles of Mg reacted= mass of Mg/ molar mass of Mg= 0.025/24.3050= 0.00103 moles. 12- Moles of H2 FORMED= 0.00103 moles.

13- Convert the temperature from Celsius to Kelvin= 19 + 273 = 292 k 14- Convert volume of H2 from ML to L = 25-3.5= 21.5 / 1000= 0.0215 l 15- Pressure of dry h2 (p)= 760-vapor pressure of water) = 743.5/760= 0.978 ATM 16- In the end find R, the gas Constance R=PV/NT= .07 (atm.L/k.Mole)

Summary: In this experiment we’ve learned that Magnesium react with acid to give H2 gas. We learned how to calculate the temperature, the volume and the gas Constance R