EMPIRICAL FORMULA Due Today: 1. Empirical Formula Pre- Lab 2. Density Short Report Homework: 1....
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Transcript of EMPIRICAL FORMULA Due Today: 1. Empirical Formula Pre- Lab 2. Density Short Report Homework: 1....
EMPIRICAL FORMULA
Due Today: 1. Empirical Formula Pre-Lab
2. Density Short Report
Homework:1. Empirical Formula Formal Lab Report
Experimentally determine the empirical formula of:
Zinc and chloride reaction
Copper and sulfur reaction
OBJECTIVE
Part I: Zinc ChlorideProcedure 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 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 NOTES
When heating, AVOID spattering
Make sure to get data from another lab group
Return evaporating dish to the oven
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 NOTES
When the flame disappears, heat to red hot
Make sure to get data from another group
Return crucible and lid to the oven
PROCEDURE NOTES
Dispose of contents in an appropriate waste container
WASTE
Hydrochloric AcidDanger
Inhalation Hazard
Corrosive
RISK ASSESSMENT
To calculate moles:
Mole Ratio:
CALCULATIONS
massmolar
mass moles
molesleast with compound
molesgreatest with compound
moles
moles ratio mole
Mole ratio:
Examples:
1:2
2:1
A ratio should never be reported as a single
number
CALCULATIONS