Hypothesis: If the presence of salt dissolved in water is increased, then the rate of corrosion will increase. Aim: To compare the rates of corrosion of different nails by adding them to different samples of water, both salt and fresh, and then analysing the rate in which the nails corrode . Metals corrode via a process called redox reactions. Corrosion causes substantial costs to the economy as water pipes and buildings corrode very easily. On average $50 billion is spent annually in an attempt to prevent metals from corrosion. Corrosion is widely known for its orange-brown flakes known as rust. Corrosion can happen via two ways, either dry corrosion, which is a direct reaction with oxygen to form metal oxide. The other form of corrosion is, wet corrosion. Wet corrosion is known for the presence of moisture which accelerates the process in which metals rust. It can occur in moist air or when in …show more content…
Alloying: When a substance is formed when other materials are mixed with a metal. Cathodic protection: use of a low voltage power supply to ensure that a reduction reaction occurs at a metal surface to prevent corrosion. This investigation will focus on the experiment conducted to identify the effects and rate in which different nails corrode under different wet corrosion methods; via simple wet corrosion by placing the nails in fresh water, and via placing nails in water with salt impurities. By doing this it will hopefully be concluded that metals do corrode faster when in the presence of impurities in water. [1] 1. If necessary, clean the nails with fine sandpaper. Weigh each nail and record initial results. 2. Label each test- tube with either tap water or salt water, and place a nail in each one. 3. Add tap water to the first 4 test tubes labelled tap water, ensure to cover the nails with 50ml of
sample using a triple beam balance. Then, fill the small chamber about halfway with water and measure
4. Pour about 300mL of tap water into the beaker. Set up a hot-water bath using a hot plate, retort stand, and thermometer clamp. Alternatively, use a Bunsen burner, retort stand, ring clamp, thermometer clamp, and wire gauze.
*PURPOSE: To learn which type of salt lowers the Freezing Point of water the greatest amount.
Using the eyedropper, fill the plastic test tube from the lead testing kit about one-fourth of the way full with test solution from cup 1.
Artificial nail structures are applied to enhance the natural nail by increasing its length, improving overall appearance and to strengthen and repair.
For this project you need many things. The first things you need are three plastic cups. The rust may stain on the cups so I recommend plastic ones. You want three nails covered in rust. All the nails must be the same size. You need a camera to take pictures of the changes that occur to the nail. Also, you need to get water, coke, and vinegar. It doesn’t matter what type of vinegar but I recommend regular coke. I would also appreciate it if you use tap water. The last thing you need is paper and a pencil.
hydrogen peroxide and 3mL of water. Test tube 1 was placed in an ice bath, test tube 2 was
Sticky notes were used to label each beaker and petri dish with the concentration of NaCl (0%, 5%, 10%, 15%, 20%).
In each test tube, place 5ml of pure hydrogen peroxide into each test-tube using the syringe.
Fill another test tube with 200 mL of plain water and label it Negative Control.
The goal of this experiment was to: create a dilute NaCl solution and calculate molarity, molality, and parts per million, experimentally determine the molarity of the same dilute NaCl solution through Mohr chloride precipitation technique, then, evaluate the accuracy by comparing the actual value to the experimental one. The actual molarity was calculated using the average density of three trials, mass of NaCl in solution, and molarity formula to be 0.0140 mol/L, the molality was calculated to be 0.0143, and the PPM was calculated to be 833. The experimental value for molarity, obtained through titration using AgNO3 as a titrant with Ag2CrO4 as an indicator, was averaged over three trials to be .01523 mol/L. Comparing experimental and actual values gave an estimated standard deviation of 0.00032 M with a confidence interval of +0.00079 at 95% and +0.0018 at 99%. The percent error for molarity was 8.8%. The experimentally determined molarity was functionally close to the actual molarity, however, some significant error in accuracy was observed. The amount of precision achieved with reasonable accuracy suggests this experiment could be used in testing salinity of separate bodies of water for comparison. The high % error inaccuracy, however, also suggests this should not be used in comparing minute changes in salinity in a single body of water.
For the liquid measures like oils and water, the correct eye level on reading the measurements is important because the wrong eye level will cause the reading of measurement inaccurate. The measuring cup should be placed in the flat surface and take the readings with your eye at the level of the liquid. Water surface curves downward, so use the bottom of the curve for accurate measurement and not the edge that is against the measuring cup.
2) A several drops of bromine water was added from a dropper bottle to the test tube and the test tube was shaken well.
Corrosion may be defined as the deterioration of a material due to a reaction with the environment around it. Metals corrode because we use them in environments that are chemically unstable. Very few metal are found in nature in their metallic state such as copper, gold and silver . All other metals are processed from minerals or ores into metals which are innately unstable in their environments. These unstable metals have a tendency to revert to their more stable mineral forms. Some metals form protective ceramic films (passive films) on their surfaces and these prevent, or slow down, their corrosion process. We can prevent corrosion by using metals that form naturally protective passive films, but these alloys are usually expensive, so we have developed other means of corrosion control. That are discussed later in this paper.
Corrosion can take place on many different materials ranging from metal, being one of the more common materials to corrode, to some ceramics and polymers. Corrosion is typically an electrochemical reaction that takes place with the material being degraded as it reacts with its surrounding environment. When this reaction takes place, the metal gives up electrons which aids in the rust and oxidation formed on the metal. Corrosion usually takes place because most materials are manmade and therefore are unstable and tend to try and revert back to its original state. As an example you can picture a plate of uncoated steel hanging outside. Over a period of time the steel plate will begin to corrode do to its reaction with the oxygen in its surroundings. If you take that same steel plate and add water in the mix, it will corrode at a more aggressive rate then the plane steel because the water allows for more oxygen and iron ion reactions. Now take that same plate and put it in a salt water environment and it will corrode at an even more aggressive rate due to the presence of sodium chloride ions.