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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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Presentation Transcript
empirical formula

Due Today:

1. Empirical Formula Pre-Lab

2. Density Short Report

Homework:

1. Empirical Formula Formal Lab Report

Empirical Formula
objective
Objective
  • Experimentally determine the empirical formula of:
    • Zinc and chloride reaction
    • Copper and sulfur reaction
procedure notes
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!
procedure notes1
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
procedure notes2
Procedure Notes
  • When heating, AVOID spattering
  • Make sure to get data from another lab group
  • Return evaporating dish to the oven
procedure notes3
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
procedure notes4
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
waste
Waste
  • Dispose of contents in an appropriate waste container
risk assessment
Risk assessment
  • Hydrochloric Acid
    • Danger
    • Inhalation Hazard
    • Corrosive
calculations
calculations
  • To calculate moles:
  • Mole Ratio:
calculations1
calculations
  • Mole ratio:
    • Examples:
      • 1:2
      • 2:1
      • A ratio should never be reported as a single number
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