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