Empirical Formula of a Compound
Empirical Formula of a Compound * Purpose: To determine the empirical formula of Magnesium Chloride. * Data
1. Mass of evaporating dish = 45.08g 2. Mass of evaporating dish and Magnesium = 45.17g 3. Mass of Magnesium: { 2 } – { 1 } = 0.09 4. Mass of evaporating dish and Magnesium Chloride First weighing = 45.48g
(After heating and cooling) second weighing = 45.49g 5. Mass of Magnesium Chloride: { 4} – { 1 } = 0.41g 6. Mass of chlorine in Magnesium Chloride: { 5 } – { 3 } = 0.32g 7. Moles of Magnesium: 0.09g x 1mol = 0.004mol 24.31g 8. Moles of Chlorine: 0.32g x 1mol = 0.009mol 35.45g 9. Moles of Magnesium divided by the smaller number of moles: Mg = 0.004g =1 0.004g (1x4 = Mg4) 10. Moles of chlorine divided by the smaller number of moles: Cl = 0.009mol = 2.25g 0.004mol (2.25x4 = Cl9) 11. My experimental empirical formula of magnesium chloride = Mg4Cl9 12. True known empirical formula of Magnesium Chloride = MgCl2
* Analysis: Post Lab
1. An evaporating dish was more suitable for this lab procedure, rather than using a beaker because the solid product spreads out more in the evaporating dish as the liquid evaporates (Facilitating drying). In a beaker, the vapours of liquid tend to condense on the walls and run back down (Inhabiting drying). 2. The experimental formula of Magnesium
1. Mass of evaporating dish = 45.08g 2. Mass of evaporating dish and Magnesium = 45.17g 3. Mass of Magnesium: { 2 } – { 1 } = 0.09 4. Mass of evaporating dish and Magnesium Chloride First weighing = 45.48g
(After heating and cooling) second weighing = 45.49g 5. Mass of Magnesium Chloride: { 4} – { 1 } = 0.41g 6. Mass of chlorine in Magnesium Chloride: { 5 } – { 3 } = 0.32g 7. Moles of Magnesium: 0.09g x 1mol = 0.004mol 24.31g 8. Moles of Chlorine: 0.32g x 1mol = 0.009mol 35.45g 9. Moles of Magnesium divided by the smaller number of moles: Mg = 0.004g =1 0.004g (1x4 = Mg4) 10. Moles of chlorine divided by the smaller number of moles: Cl = 0.009mol = 2.25g 0.004mol (2.25x4 = Cl9) 11. My experimental empirical formula of magnesium chloride = Mg4Cl9 12. True known empirical formula of Magnesium Chloride = MgCl2
* Analysis: Post Lab
1. An evaporating dish was more suitable for this lab procedure, rather than using a beaker because the solid product spreads out more in the evaporating dish as the liquid evaporates (Facilitating drying). In a beaker, the vapours of liquid tend to condense on the walls and run back down (Inhabiting drying). 2. The experimental formula of Magnesium