This website uses cookies to ensure you have the best experience. Learn more

Chem Lab Essay

2109 words - 9 pages

____________ [Chemistry 3] Experiment No 3.1

Philippine Science High School - Central Visayas Campus
Talaytay, Argao, Cebu, Philippines

Date performed: December _, 2013
Date submitted: January 6, 2013

Corrosion is a process through which metals in manufactured states return to their natural oxidation states, a reduction-oxidation reaction in which the metal is being oxidized by its surroundings, often the oxygen in air [1]. The first part of the experiment involved the products of rusting. Certain amounts of 3% NaCl, 10% K3Fe(CN)6 and ...view middle of the document...

For the copper wire – iron nail combination, it was concluded that the iron nail “rusts” while the copper didn’t react with anything, so the copper wire was the cathode site while the iron nail was the anode site. In bimetallic corrosion, corrosion of a metal is accelerated when placed in contact with metal with a different and higher potential. The metal which oxidizes easily and is the anode will be the one that will corrode.


Corrosion is usually defined as degradation of the properties of a material as a result of chemical reaction with the environment. [1] Corrosion is a spontaneous electrochemical process that has caused tens of billions of dollars of damage to cars, ships, buildings, and bridges each year. The most common and economically destructive form of corrosion is the rusting of iron. Rust is not a direct product of the reaction between iron and oxygen but arises through a complex electrochemical process. [2]
There were two parts of the experiment. The first one involved the products of rusting. 15 mL of 3% NaCl, 4 drops of 10% K3Fe(CN)6 and 2 drops of phenolphthalein were combined in a small beaker. In this mixture, a piece of plain white paper napkin was folded and was soaked. After soaking, two nails (one straight, one bent) were wrapped in the folded damp paper allowing space between them. This setup was left for 10 minutes. After which, colors formed in the paper napkins were observed. The second part of the experiment was the bimetallic corrosion. Two iron nails were cleaned using sand paper. In one iron nail, copper wire was coiled around its tip. On the other iron nail, a zinc granule was attached to its tip. Another plain white paper was folded and was soaked in the mixture with 3% NaCl, 10% K3Fe(CN)6 and phenolphthalein. The iron nail with a zinc granule attached to its tip and the iron nail with the coiled copper wire were wrapped separately in the soaked folded paper napkins and were for 10 minutes. Again, the folded papers were opened and sites where pink and blue colors formed were examined. This experiment aims to infer the products of rusting, determine anodes and cathodes of different iron nail setups and to be able to make a general statement about bimetallic corrosion.


After leaving the first setup for 10 minutes, pink and blue-green colors appeared on the paper as seen in Figures 1 and 2.

Figure 1. Parts of the iron nails where the color pink appeared

Figure 2. Parts of the iron nails where the color pink appeared
Corrosion usually happens in a location where the metal is under stress (at a bend or weld) or is isolated from the air. The metal ions dissolve in the moisture film and the electrons migrate to another location where they are taken up by a depolarizer which in this case, is oxygen. The resulting hydroxide ions (OH-) react with the Fe2+ to form the mixture of hydrous iron oxides known as “rust” [4]. Corrosion is actually...

Other assignments on Chem Lab

Amorphous Thermoplastics Essay

8784 words - 36 pages aging on an insulator after 30 years, no one can wait 30 years. To resolve this problem, H.M. Schneider and his associates first ever put the concept of accelerated multi stress lab aging in 1991. S. Amin and M. Amin tamination severity for polymeric insulators which have high hydrophobicity. Polymeric insulators produce increased audible noise but decreased radio interference as a result of aging. J. L Fierro Chavez, et al. [62] developed a

Dissolved Oxygen Essay

3465 words - 14 pages 12.097 Environmental Chemistry of Boston Harbor – IAP 2006 Lab 1: DETERMINATION OF DISSOLVED OXYGEN BY WINKLER TITRATION 1. Background Knowledge of the dissolved oxygen (O2) concentration in seawater is often necessary in environmental and marine science. It may be used by physical oceanographers to study water masses in the ocean. It provides the marine biologist with a means of measuring primary production - particularly in laboratory


714 words - 3 pages The first ethical issue presented in the ethics game simulation was whether to warn consumers about the contaminated product and what information to provide consumers about the contaminant. The second ethical issue was whether to sell a product that does not meet U.S. safety requirements in a foreign market that has lower safety restrictions. G-BioSport was not required to meet prior approval from the Federal Drug Administration before they

Economy Effect Of Marijuana

277 words - 2 pages Modern American History by Alan Renga 2nd Mid Term! You will be given 3 Short Essay questions and 20 Multiple Choice questions deriving from this list! 80 points total! The 1920s Warren Harding then Calvin Coolidge Tea Pot Dome 1st Red Scare Immigration Restriction, Sacco and Vanzetti Langston Hughes, Marcus Garvey, KKK Prosperity, advertising Prohibition, Al Capone Flappers, Clara Bow, Rudolph Valentino Babe Ruth, Jack Dempsey

The Vc Shakeout

2033 words - 9 pages ECONOMY 26 Luring a big firm to town is not the secret to job growth DEFEND YOUR RESEARCH 30 Are morning people wired for success? VISION STATEMENT 32 The social web’s east-west divide COLUMN 38 Warren Bennis looks back on his surprising path to fame New Thinking, Research in Progress New Thinking, Research in Progress FIRST The VC Shakeout Venture capital hasn’t worked for a decade and must be radically

Hospitals Paper

6014 words - 25 pages I hope to provide in this paper a comprehensive understanding for what the term “hospital” has become. Hospitals are an extremely complex system that man has created and shaped and reshaped throughout history. My goal in writing and researching this paper will be to provide those who read it a clear understanding on how the hospital system got to where it is today, and to shed some light on the many organizations that affiliate with and

Course Syllabus

2610 words - 11 pages . Note: Software may already be installed on the school’s lab computers; check with your lab administrator. Need Help? Contact Product Support at for live CHAT, email or phone support. MyMathLab includes access to the Pearson Math Tutor Center! Visit for available tutoring services. Call for help toll-free help at 1-888-777-0463 ▪ Sunday through Thursday, 4 PM - 11 PM


1477 words - 6 pages Boeing Management Planning Heather Oetzel MGT 330 October 22, 2012 Joe Cheng Abstract Boeing is known as “the world’s leading aerospace company and the largest manufacturer of commercial jetliner and military aircraft combined ("The Boeing Company: About Us", 2012). Every company uses different types of management techniques including how the planning function of management is used. Planning allows organizations to develop how the

Assisted Suicide

1015 words - 5 pages Should physician-assisted suicide be legal? While I believe if one chooses to end his or own life through physician assistance for reasons that they chose, the choice should be up to the individual. Physician-assisted suicide should be at one's discretion. “Assisted Suicide, also called Voluntary Euthanasia, is currently a contentious issue in many countries. Because Euthanasia is legal in a few modern democracies: the Netherlands, Belgium

Tanglewood Case 1

797 words - 4 pages Tanglewood’s staffing strategy requires the organization to make key decisions about the acquisition, deployment, and retention of the organization’s workforce. In order to accomplish this, Tanglewood’s must make thirteen decisions regarding its staffing levels and its staffing quality. One of the first decisions that Tanglewood needs to choose is to acquire or develop talent. Tanglewood should try to develop their current talent because one


1391 words - 6 pages Есе по въпроса: Кои от всички „действащи” лица могат да се разглеждат като морално отговорни и в какво именно? по казуса Форд „Пинто” Корпоративните злодеяния са нанесли повече вреди на обществото от всички улични престъпления взети заедно. Според данни на ФБР сумата от уличните престъпления възлиза на $3.8 млрд. годишно, а загубите от корпоративните измами между $100 млрд. и $400 млрд. годишно

Similar Documents

Lab Course Go Virtual Essay

631 words - 3 pages Lab oourses go virtual A Thomas F. Edgar University of Texas number of universities have main- tained a dedicated laboratory course as part of the process control sequence, but those numbers have been shrinking due to the high resource requirements of lab courses and the pressure to reduce the number of hours in the engineering curriculum. While some chemical engineering departments run

Density Lab Report

342 words - 2 pages Chem 1A Brown 3 July 2014 Density Lab Report Objective: The purpose of this lab was to experimentally determine the density in three different investigations. Prelab procedure outline: What is the Density of an Egg? 1. Obtain the egg and note any observations. 2. Obtain a 400-ml beaker. 3. Add 200-ml of water into the beaker. Record the volume. 4. Place the raw egg into the water and record the volume and any

A Grignard Synthesis Of Triphenylmethanol Essay

2219 words - 9 pages  Chem‐106  Grignard Synthesis of Triphenylmethanol Objective: The purpose of this experiment is to synthesize triphenylmethanol from benzophenone via Grignard reaction. The product will be isolated through extractions and purified by recrystallization. Reaction efficiency will be evaluated through percent yield, percent recovery, and the purity of the final product will be determined by IR, TLC, and mp determination. Chemicals

Atul Essay

2517 words - 11 pages , Meghmani Organics, Colortex, Sudarshan Chemicals, Colour Chem, Ciba Speciality, BASF, Clariant India, IDI and Metrochem. The Indian companies account for 6% of the world dye production. The organized sector, with a better product range, technology and marketing reach, has been able to increase market share. Further bans on certain dyestuffs due to regulatory norms from the European markets and stricter local pollution norms have forced many in the