Corrosion Lab

Topics: Hydrogen, Metal, Hydrochloric acid Pages: 11 (1678 words) Published: September 20, 2014
CORROSION LAB REPORT
THE CHANGE IN MASS(­±0.005g) OF VARIOUS TYPES OF CORROSIVE METALS WHEN PLACED IN A SOLUTION OF 1 MOLAR CONCENTRATION OF HYDROCHLORIC ACID OVER A PERIOD OF 8 DAYS AT AN AVERGAE ROOM TEMPERATUR OF 24 DEGRESS CELCIUS. Research Question: Does the mass(±0.005g) of various types of corrosive metals (iron, nickel, zinc, copper and tin) change when placed in a solution of 1 molar hydrochloric acid over a period of 8 days at an average room temperature of 24 degrees Celsius? Aim: To be able to record and understand if and why a change in mass (±0.005g) occurs in various types of corrosive metals that include iron, nickel, copper, zinc and tin when placed in a solution of 1 molar concentration of hydrochloric acid over a period of 8 days at an average room temperature of 24 degrees Celsius. Hypothesis: In my prediction, there will be a negative change in mass (±0.005g) in the various types of metals (iron, nickel, zinc, copper and tin) when placed in a 1 molar solution of hydrochloric acid at an average room temperature of 24 degrees Celsius for a time span of 8 days. This means that the mass (±0.005g) will decrease when measured after the time span of 8 days. This reaction occurs and the various types of metals decrease in mass (measured in grams) as Hydrochloric acid is hydrogen chloride or HCl. When HCl reacts with a metal, the metal replaces hydrogen in the compound, forming a metal chloride and hydrogen gas. Therefore corrosion will occur and the mass (±0.005g) of the metal will decrease when potentially strong reactions occur between chloride ions and the base metal, (example: iron, nickel, zinc, copper and tin). Variables:

Dependent Variable: Mass of the Metal (±0.005g)
Independent Variable: Type of Metal

Controlled Variable:
a. Concentration of the Acid: Hydrochloric Acid (in Molars) b. Volume of the Solution (cm^3)
c. Time Period (in days)
d. Temperature (in Celsius)

SR NO.
CONTROL VARIABLE
WHY IS IT A CONTROLED VARIABLE?
HOW CAN THE VARIABLE BE CONTROLLED?
1.
Concentration Of Hydrochloric Acid (in Molars)
The concentration of the acid must be controlled and the same for all metals because if the concentrations are different some metals might corrode faster than other in the uniform time period thus resulting in non-uniform change in mass (±0.005g) The variable can be controlled by creating a fair amount of hydrochloric acid with concentration of 1 molar and use this same concentration for all the types of metal each of the 5 times tested. 2.

Volume Of Hydrochloric Acid (cm ^3)
The volume of acid must be controlled and uniform as the usage of more acid for one type of metal may result in faster corrosion and vice versa The volume of an acid can be controlled by measuring the same amount of hydrochloric acid used when pouring it into the 5 different test tubes of a particular metal and doing the same for all the other types of metals used

Continuation of Control Variable Table-page 2
SR.NO.
CONTROL VARIABLE
WHY IS IT A CONTROLLED VARIABLE?
HOW CAN IT BE CONTROLLED?
3.
Time Period (in days)
The time period for which the metals have to be placed in the acid must be controlled because if all the metals do not have a uniform time period for corrosion some metals may corrode more than others when kept for a longer period of time and vice versa

The time period can be controlled by placing all the different types of metals in the hydrochloric acid for the same amount of time before removing them all from the acid and weighing their mass (±0.005g) 4.

Temperature (in Celsius)
The temperature where the experiment is conducted must be uniform for all the different types of metals because if it is too cold the acid will freeze and if it is too warm the acid will boil and evaporate. Change in temperature for each type of metal may result in a different reaction for corrosion. The temperature can be...


Cited: "Corrosion in Hydrochloric Acid (HCl)." Corrosion in Hydrochloric Acid. N.p., n.d. Web. 10 Dec. 2013. .
"How Does Hydrochloric Acid Corrode Metal?" Answers, n.d. Web. 11 Dec. 2013. .
"What Is Corrosion?" About.com Metals. N.p., n.d. Web. 10 Dec. 2013. .
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