<< Chapter < Page Chapter >> Page >

Experiment 3: colorful copper

Objective

  • To observe, describe and explain the products of a number of chemical reactions of the transition metal copper.
  • To use several techniques in recovering copper from solution.
  • To understand the concept of percent yield.

Grading

  • Pre-lab (10%)
  • Lab Report (80%)
  • TA points (10%)

Before coming to lab…

  • Read the lab instructions
  • Complete the pre-lab, due at the beginning of the lab.

Introduction

Copper is a soft metal with a characteristic color that we often call "copper-colored", a bright orange-brown color. Copper is relatively inert chemically; it does not readily oxidize (react with oxygen) in air and is react when exposed to simple mineral acids such as sulfuric or hydrochloric acid. One of the most popular uses of copper is in the computer industry where it is used to build the integrated circuits and chips. It is beginning to replace aluminum for this application due to the resulting decrease in costs. Copper is also good at conducting electricity because it has so many free electrons that allow for the efficient flow of current.

In this lab you will preform a series of reactions with copper and observe a variety of distinctive and colorful products. Most chemical syntheses involve the separation and then purification of a desired product from unwanted side products. The common methods of separation are filtration, sedimentation, decantation, extraction, chromatography and sublimation.

This experiment is designed as a quantitative evaluation of your laboratory skills in carrying out a series of chemical reactions, purification and analyses with copper. You will employ two fundamental types of chemical reactions, namely oxidation-reduction (redox) and metathesis (exchange) reactions to recover pure copper with maximum efficiency. The chemical reactions involved are the following.

Redox: Cu ( s ) + 4HNO 3 ( aq ) Cu ( NO 3 ) 2 ( aq ) + NO 2 ( g ) + 2H 2 O ( l ) size 12{"Cu" \( s \) +"4HNO" rSub { size 8{3} } \( "aq" \) rightarrow "Cu" \( "NO" rSub { size 8{3} } \) rSub { size 8{2} } \( "aq" \) +"NO" rSub { size 8{2} } \( g \) +"2H" rSub { size 8{2} } O \( l \) } {} [1]

*Metathesis: Cu ( NO 3 ) 2 ( aq ) + 2 NaOH ( aq ) Cu ( OH ) 2 ( s ) + 2NaHO 3 ( aq ) size 12{"Cu" \( "NO" rSub { size 8{3} } \) rSub { size 8{2} } \( "aq" \) +2"NaOH" \( "aq" \) rightarrow "Cu" \( "OH" \) rSub { size 8{2} } \( s \) +"2NaHO" rSub { size 8{3} } \( "aq" \) } {} [2]

Dehydration: Cu ( OH ) 2 ( s ) + heat CuO ( s ) + H 2 O ( g ) size 12{"Cu" \( "OH" \) rSub { size 8{2} } \( s \) +"heat" rightarrow "CuO" \( s \) +H rSub { size 8{2} } O \( g \) } {} [3]

Metathesis: CuO ( s ) + H 2 SO 4 ( aq ) CuSO 4 ( aq ) + H 2 O ( l ) size 12{"CuO" \( s \) +H rSub { size 8{2} } "SO" rSub { size 8{4} } \( "aq" \) rightarrow "CuSO" rSub { size 8{4} } \( "aq" \) +H rSub { size 8{2} } O \( l \) } {} [4]

Redox: 3CuSO 4 ( aq ) + 2 Al ( s ) Al 2 ( SO 4 ) 3 ( aq ) + Cu ( s ) size 12{"3CuSO" rSub { size 8{4} } \( "aq" \) +2"Al" \( s \) rightarrow "Al" rSub { size 8{2} } \( "SO" rSub { size 8{4} } \) rSub { size 8{3} } \( "aq" \) +"Cu" \( s \) } {} [5]

Each of these reactions proceeds to completion and in the case of a metathesis reaction, completion is reached when one of the components is removed from the solution in form of a gas or an insoluble precipitate. This is the case for reactions [1], [2], and [3]. In reactions [1]and [3] a gas is formed and in reaction [2]an insoluble precipitate is formed (Reaction [5] proceed to completion because copper is more difficult to oxidize than aluminum).

Metathesis (Exchange) Reaction Defined in Chapter 4 of your textbook: 'One of the following is needed to drive a metathesis reaction: the formation of a precipitate, the generation of a gas, the production of a weak electrolyte, or the production of a nonelectrolyte.'

Oxidation-Reduction (Redox) Reactions. This involves the loss of electrons from one components and an addition of electrons to the other component as the reaction proceeds (the are transferred from one atom to another). The component that loses electrons is said to be oxidized; the one that gains electrons is then reduced. Such reactions are important for the production of electricity due to the energy produced from an electron transfer.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Gen chem lab. OpenStax CNX. Oct 12, 2009 Download for free at http://cnx.org/content/col10452/1.51
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Gen chem lab' conversation and receive update notifications?

Ask