<< 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

What would you say about the the mobility of enterprise as a factor of production?
Cathryn Reply
how can I connect myself to this Ambrose platform
kanu Reply
I am good and you I am from sierra Leone and I am new her
kanu Reply
u are welcome bro, here is a good platform for you to be
Alie
That i know,thanks bro.
what the main definition of economic
Uhara Reply
Essay about Microsoft
Kwena Reply
what is economics
Julie Reply
what do you mean by means in economics
Julie
economic is the wealth of a country.
Moussa
monetary policy is refer to as being expansionary or contractionary.
Abdul
pls who can help me to explain money market and capital market
Au
money market is base on short term loan which is within one year period while capital market is long term loan more than one year...
Muhammad
money market is a market were short term loans are dealt with while capital market is a market were long term loans are traded
Ebrima
What is mean by monetory policy
Lovely
monetary polices are rules that control the rate of monetary exchange in an economic as a whole.
Ebrima
wealth of the nation
Uhara
important of unemployment
Otwe Reply
Important of unemployed
Otwe
important?
Aneela
what is meaning scarcity
ABDULLAHI Reply
Scarcity can be define as human wants to goods,services,resources for exceed of what is available
Uhara
hi guys
Ibrahim
How are you
Abdul
Can be defined as the inability to get everything we want
Zuko
less ability for the available goods and services that's on sale
kanu
what is consumer
Brenda Reply
how do consumer help people
Brenda
by export trading
Jayah
How do you mean Jayah
Danjuma
what is different between price and quantity
Yakubu
what is MRS
Rashid
definition of economics according to Adam Smith
Ijeoma Reply
economic is a wealth of nation
Au
in the view of Adam Smith economics is the study of activities of people in production of wealth
suresh
Economics is any human activity that lead to the provision of substance and or amassing wealth.
What do you really think is the remedy for scarcity in Nigeria 🇳🇬
John Reply
different the term economics
zfekere Reply
importance of studying economics
Haruna Reply
importance of economics
Haruna
different the term economics
zfekere
mixed economic
tadesse
you have just been appointed in the director of finance for your state internal revenue board with the knowledge of elasticity advice the state government on how the I.G.R of the state could be raised through exercise duties bearing in mind the implication and incident of taxing setting products
Kenechukwu Reply
Hello,Thanks for your replay
Esmael
fine
IDRIS
mention 5 characteristics of traditional societies
Pono Reply
dominance of agriculture and ignorance of development avenues are some characteristics of traditional societies.
sade
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