Purpose: to experimentally determine the mass percentage of two components (Al and Mg) in a mixture...

    

Transcribed Image Text:

Purpose: to experimentally determine the mass percentage of two components (Al and Mg) in a mixture by collecting and measuring the gaseous product (H2). Equations: write the balanced chemical equations for the two reactions that are taking place in this experiment. 7 A1+6HCI ZAICI, + 3H₂ Mg + 2HC1 MgCl₂+ H₂ Procedure: 1) Obtain a sample of the Al/Mg mixture, weighing between 0.0200g -0.0300g. Accurately record the amount that you measure out. 2) Pour the mixture into a DRY test tube. Your apparatus will be set up as shown in the simple diagram below. Use a burette clamp and ring stand to hold the eudiometer in place, and hold the test tube in your hand. 3) Very quickly, add about 3 mL of 3M HCI to the test tube and put the rubber stopper into the mouth of the test tube before any gas can escape. Ensure that the gas is bubbling into the eudiometer. 0.003L, 3M t = 0.009 mols HCI 4) Once the reaction is complete (i.e. there is no metal left in your tube and bubbling has stopped), measure the volume of the gas produced and record. You must make sure that the pressure inside the eudiometer is equal to the atmospheric pressure before you measure the volume of the gas. Your teacher will demonstrate how to do this. 5) Dispose of chemicals as directed by your teacher and clean all glassware. PV=IRT Data: Mass of Al/Mg mixture used (in grams) Room temperature (in °C) Room temperature (in K-show calculation!) Water temperature (in °C) Atmospheric pressure (in kPa) Atmospheric pressure (in atm-show calculation!) Partial pressure of H2(g) (in atm-show calculation!). Volume of H2(g) produced (in mL) 0.0300g 22°C 22+273 295k 22°C 103.8 kPa 103.814 Paxlatm 101.325 kPa = 1.024 atm P1,024 afm-0.026 atm = 0.998 atm) P-32 9 33.9mL Volume of H2(g) produced 33.9mxx -0.0339 L (in L-show calculation!) 10³ AL Analysis: Calculate the percent by mass of aluminum and magnesium in the original mixture. (0.004 mol HC 1% Al = What are the sources of error in this experiment? % Mg= Purpose: to experimentally determine the mass percentage of two components (Al and Mg) in a mixture by collecting and measuring the gaseous product (H2). Equations: write the balanced chemical equations for the two reactions that are taking place in this experiment. 7 A1+6HCI ZAICI, + 3H₂ Mg + 2HC1 MgCl₂+ H₂ Procedure: 1) Obtain a sample of the Al/Mg mixture, weighing between 0.0200g -0.0300g. Accurately record the amount that you measure out. 2) Pour the mixture into a DRY test tube. Your apparatus will be set up as shown in the simple diagram below. Use a burette clamp and ring stand to hold the eudiometer in place, and hold the test tube in your hand. 3) Very quickly, add about 3 mL of 3M HCI to the test tube and put the rubber stopper into the mouth of the test tube before any gas can escape. Ensure that the gas is bubbling into the eudiometer. 0.003L, 3M t = 0.009 mols HCI 4) Once the reaction is complete (i.e. there is no metal left in your tube and bubbling has stopped), measure the volume of the gas produced and record. You must make sure that the pressure inside the eudiometer is equal to the atmospheric pressure before you measure the volume of the gas. Your teacher will demonstrate how to do this. 5) Dispose of chemicals as directed by your teacher and clean all glassware. PV=IRT Data: Mass of Al/Mg mixture used (in grams) Room temperature (in °C) Room temperature (in K-show calculation!) Water temperature (in °C) Atmospheric pressure (in kPa) Atmospheric pressure (in atm-show calculation!) Partial pressure of H2(g) (in atm-show calculation!). Volume of H2(g) produced (in mL) 0.0300g 22°C 22+273 295k 22°C 103.8 kPa 103.814 Paxlatm 101.325 kPa = 1.024 atm P1,024 afm-0.026 atm = 0.998 atm) P-32 9 33.9mL Volume of H2(g) produced 33.9mxx -0.0339 L (in L-show calculation!) 10³ AL Analysis: Calculate the percent by mass of aluminum and magnesium in the original mixture. (0.004 mol HC 1% Al = What are the sources of error in this experiment? % Mg=