copper - Percent Copper and Formula Weight of Copper(II)...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Pentahydrate Objective: The purpose of this experiment is to determine the percent copper and the formula weight of copper(II) sulfate pentahydrate (CuSO 4 5H 2 O). Safety Tips: Wear safety goggles at all times in the laboratory. HANDLE ALL SOLUTIONS WITH CAUTION. If acid and/or base is spilled on the counter top, clean it up immediately. IF A CHEMICAL IS SPILLED ON THE SKIN, IMMEDIATELY RINSE THE AREA WITH LARGE AMOUNTS OF WATER. Dispose of all solutions per instructor's directions. HCl is a corrosive acid. Be careful. H 2 gas is flammable. Keep flames away from the area of the reaction. Alcohol and acetone are very flammable. Do not place near open flames. Background: Many chemical reactions involve the transfer of electrons from one atom to another. These reactions are called oxidation-reduction reactions. In a reaction that involves electron transfer, reduction refers to the gain of electrons by an atom and oxidation refers to the loss of electrons by another atom. Oxidation and reduction do not occur separately, they are complementary processes. They always occur simultaneously and in equal amounts: the number of electrons gained by one substance must equal the number of electrons lost by another. In this experiment copper(II) ions from the copper(II) sulfate pentahydrate will be reduced to copper metal and magnesium solid will be oxidized to magnesium(II) ions. The first part of this experiment is the reduction of copper(II) ions to metallic copper in a weighed sample of copper(II) sulfate pentahydrate using magnesium metal. The displacement of copper (reduction of copper ions to copper metal) by magnesium (oxidation of magnesium solid to magnesium ions) will take place in an aqueous (dissolved in water) solution of a weighed sample of copper(II) sulfate pentahydrate. Molecular equation ) ( 5 ) ( ) ( ) ( ) ( 5 2 4 2 4 l O H aq MgSO s Cu s Mg aq O H CuSO + + + Net ionic equation ) ( ) ( ) ( ) ( 2 0 0 2 aq Mg s Cu s Mg aq Cu + + + + An excess of metallic magnesium will be used to ensure complete displacement of copper from the CuSO 4 5H 2 O solution. After the copper has been completely displaced, hydrochloric acid (HCl) will be added to dissolve the excess magnesium. This reaction produces hydrogen gas (H
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/29/2010 for the course SCI none taught by Professor None during the Spring '10 term at Armstrong State University.

Page1 / 5

copper - Percent Copper and Formula Weight of Copper(II)...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online