Copper Concentration Lab Report

After this, the solution was poured into a volumetric flask just about to the 1dm3 line and then it was left there to cool to the same temperature as the room before filling precisely to the 1dm3 line with distilled water. The molar mass of CuSO4.5H20 was 249.5 so that means 249.5g of copper sulphate was needed to dissolve, in order to make a standard solution, into 1dm3of distilled water. Following this, a linear dilution of the CuSO4.5H2O was made in order to be used to make a calibration curve after using the colorimeter to write down the absorbance of each sample. A linear dilution is diluted with distilled water in order for it to make the concentration weaker and weaker. For this investigation, the dilutions made ranged from 0.01 to 0.1 M/l . It was essential to only make up 10cm3

For our science assessment we had the task to research about a metal of our choice. Since I am really into computers, I chose copper. A metal used in all kinds of wires, cpu’s and other stuff without a computer wouldn’t work. This fits really well into what we have to do for the second part, describe how this metal has helped human society.

High amounts of malathion can have some serious long term effects. The EPA’s reference dose of this chemical for the general population is .14mg/kg/day. This is the safest dose we can be exposed to while also still being effective. To pose any immediate danger, the levels of malathion in the air would have to be 250mg/m.

The purpose of the lab copper- silver nitrate reaction is to find the mole relationships between reactants and products. My hypothesis was that the mole relationship between silver and copper will be 2 mol Cu: 1 mol Ag ratio. My hypothesis is supported by the data I found during the lab. First evidence, in the beginning of my calculation I have to determine the mass of copper that reacted during the experiment and converted to moles of copper and got .0033 moles of Cu. Next, I determined the mass of silver produced during the experiment and converted into moles of silver and got .0063 moles of Ag. After I found the moles of copper and silver, I determined the value of the ratio of .0063 moles Ag /.0033 moles Cu and got 1.90 moles. 1.90 mol

The purpose of this course is to provide the fundamental knowledge of the effects of environmental chemicals on living systems, and the toxic responses of the human and plant systems. Students will discuss risk, ethics, and social responsibility with regard to environmental toxicology.

13) When the tray is thoroughly dry, determine its mass. Record the mass in the data table. You have to wait until day three to weigh the copper.

XIII. Carefully remove the copper metal from the filter paper onto the watch glass. (with a spatula) Place a 400 ml beaker on a hot plate contained with water. Carefully place the watch glass before the water boils to dry the copper metal. (Use the tongs to handle the hot watch glass)

The lab performed required the use of quantitative and analytical analysis along with limiting reagent analysis. The reaction of Copper (II) Sulfate, CuSO4, mass of 7.0015g with 2.0095g Fe or iron powder produced a solid precipitate of copper while the solution remained the blue color. Through this the appropriate reaction had to be determined out of the two possibilities. Through the use of a vacuum filtration system the mass of Cu was found to be 2.1726g which meant that through limiting reagent analysis Fe was determined to be the limiting reagent and the chemical reaction was determined to be as following:-

At 60 minutes the pectin powder was able to further reduce the copper concentration by only 53 milligrams, giving us a final copper concentration of 299 milligrams from the original 500 milligrams of contamination. After 90 minutes, the copper

Cyanide overflow incident at the Baia Mare gold mine in Romania caused the death of hundreds tons of fish and other animals, contaminated a major European hydrological system (Anke, 2000), affected the environment, and endangered water supplies in Romania and neighbor countries (Kohl, 2000).

In 1909 S.P.L. Sorensen published a paper in Biochem Z in which he discussed the effect of H1+ ions on the activity of enzymes. In the paper he invented the term pH to describe this effect and defined it as the -log[H1+ ]. In 1924 Sorensen realized that the pH of a solution is a function of the "activity" of the H1+ ion not the concentration and published a second paper on the subject. A better definition would be pH=-log[aH1+ ], where aH1+ denotes the activity of the H1+ ion. The activity of an ion is a function of many variables of which concentration is one. It is unfortunate that chemistry texts use a definition for pH that has been obsolete for over 50 years.

In the fifth reaction, 2.29 g of zinc was added to the copper (II) sulfate solution under the fume hood. The balanced equation for this reaction is written as followed:

0.5% of copper sulphate solution was added by drop at a time and and the test tube was shaked continuously.

Gozzard et al’s. (2011) study focuses on the importance of each, point source and diffuse (non-point) zinc (Zn) pollution in the River West Allen Catchment (RWAC) in the North Pennine Ore field. The River West Allen (RWA) has been subject to historical Zinc mining which came to a halt in the 1970’s but has consequently left abandoned Zinc mines which contributes as a source of pollution to the River West Allen (RWA) (Gozzard et al. 2011). Zinc in its most ecotoxic form, Zn2+, is a concern for the ecology and benthic fauna of river systems. In addition, the EU’s implementation of

Soil pollution involving the accumulation of excess heavy metals is toxic to humans and other mammalian life.1 The effect on animals can ac-cumulate in the food chains and instigate public health concerns in the future. Normally, the exposure due to food chain transfer is chronic, however, there are rare acute cases where direct ingestion of such pollutants is poisonous.2 Given the importance of the situation, the determination of toxic heavy metals in the environment is essential.