Gas Stoichiometry Collection of Oxygen Gas

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Presentation transcript:

Gas Stoichiometry Collection of Oxygen Gas NaClO (aq) + H2O2 (aq)  H2O (l) + NaCl (aq) + O2 (g) What is the purpose?

Materials and Equipment 100 ml graduated cylinder Rubber stopper Gas tube Small test tube H2O2 Ring stand Test tube clamp 250 ml Erlenmeyer flask Water tub NaClO Balance

Procedure Set up a ring stand and test tube clamp. Fill the tub with water. Fill the graduated cylinder with water. Invert and clamp the graduated cylinder to the test tube clamp. Make sure there is no air in the graduated cylinder 2. Mass 3.00 – 5.00 grams of NaClO in a 250 ml Erlenmeyer flask. Record

Procedure (cont. pg. 2) 3. Mass 3.00 – 5.00 grams of H2O2 in a test tube. Record Carefully lower the test tube of hydrogen peroxide into the Erlenmeyer flask. Don’t let it fall. Place the rubber stopper on the Erlenmeyer flask and place the free end of the gas tube into the opening of the graduated cylinder.

Procedure (cont. pg. 3) 6. Gently tip the test tube over to start the chemical reaction. 7. Observe the gas bubbles in the graduated cylinder. Record the volume of gas produced. Record the atmospheric pressure and the room temperature. 8. Repeat steps 1-7. Record as trial 2.

Data Table Mass of 6% NaClO Mass of 3% H2O2 Volume of O2 Pressure Trial 1 Trial 2 Mass of 6% NaClO Mass of 3% H2O2 Volume of O2 Pressure Temperature

Calculations TRIAL 1 1. Find mass of bleach, NaClO (6%) 2. Find mass of hydrogen peroxide, H2O2 (3%) 3. Find the moles of NaClO and H2O2. Find the limiting reactant. 4.Find the volume of oxygen gas that could form from the limiting reactant (theoretical yield). Subtract the water vapor pressure! 5. Find the actual yield of oxygen (mL or L) produced by using your data table. 7. Find the percent yield. 8. Repeat calculations 1-7 for all trials and find the average percent yield for all of your trials.

Conclusion Report any mistakes or events that occurred during the lab, that may have an impact on your results. Explain how they might affect your results. How would you judge your lab results?