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Empirical Formula

Due Today: 1. Empirical Formula Pre-Lab 2. Density Short Report Homework: 1. Empirical Formula Formal Lab Report. Empirical Formula. Objective. Experimentally determine the empirical formula of: Zinc and chloride reaction Copper and sulfur reaction . Procedure Notes.

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Empirical Formula

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  1. Due Today: 1. Empirical Formula Pre-Lab 2. Density Short Report Homework: 1. Empirical Formula Formal Lab Report Empirical Formula

  2. Objective • Experimentally determine the empirical formula of: • Zinc and chloride reaction • Copper and sulfur reaction

  3. Procedure Notes • Part I: Zinc Chloride • Procedure Change: • Use 0.2-0.25g of zinc • This MUST be done in the hood! • DO NOT touch the evaporating dish with your fingers!

  4. Procedure Notes • HCl MUST be poured in the hood! • DO NOT have the bunsen burner on! • Heat water while you are waiting for the evaporating dish to cool and the reaction is proceeding

  5. Procedure Notes • When heating, AVOID spattering • Make sure to get data from another lab group • Return evaporating dish to the oven

  6. Procedure Notes • Part II: Copper Sulfide Compound • DO NOT touch the crucible and lid with bare hands! • When heating, a blue flame should be rising from inside the crucible

  7. Procedure Notes • When the flame disappears, heat to red hot • Make sure to get data from another group • Return crucible and lid to the oven

  8. Waste • Dispose of contents in an appropriate waste container

  9. Risk assessment • Hydrochloric Acid • Danger • Inhalation Hazard • Corrosive

  10. calculations • To calculate moles: • Mole Ratio:

  11. calculations • Mole ratio: • Examples: • 1:2 • 2:1 • A ratio should never be reported as a single number

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