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Through the use of percent composition one can easily find out how much of a certain element is in a compound or an item such as a post penny.
The experiment will be using HCl a strong acid to dissolve all the zinc inside the outer copper shell.
The portion that will be measured is the mass of copper left after all of the Zn goes through the reaction process. What is the percent composition of Copper and Zinc in a post penny? The purpose is to determine the percent composition of Zinc and Copper metals in a post penny with the use of HCl.
Molarity of HCl, and year of penny. Note that HCl is an acid and must be cautious around this acid for it can burn your eyes so wear goggles, and wash hands after the lab. Retrieve a penny that is postand clean and dry the beaker you are going to use to make sure it has no residue from any previous users.
Note it will be more effective if each filling mark is at o angle of each other. Once the penny has been filed, weigh it and record its mass. Place the penny in the beaker and add the HCl. Let sit for a day and recover your penny.
After the penny seems hollow retrieve the copper shell and mass it. Once massed use the percent composition formula to find out how much copper is in a penny. Subtract your finding of the percent composition of copper from to find percent composition of zinc.
Repeat steps for multiple trials. At the end of the experiment, through the use of percent composition, the copper within the post penny was found to be 35 percent, and 65 percent zinc. The only solution to the problem is keep filing the. Human error was the largest source of error in the lab.
Finding the mass of two objects and using indirect measurements could lead you to the wrong number depending on rounding, thus slightly increasing or decreasing your percent yield in the experiment.
Also if you use the wrong sig figs while solving for the percent composition this could cause problems. If I were to retry lab, I would make sure to file more than what I thought was needed, and to make sure to get a penny of the same year for a second trial. By adding a catalyst, a change in the speed of the reaction could reduce the time needed.Percentage Composition and Empirical Formulas Lab.
Lab One: Episode – Datasheet Lab Two: Episode – Datasheet. Percentage Composition and Empirical Formulas Worksheet. Percentage Composition and Empirical Formulas Practice.
More Practice with Percentage Composition and Empirical Formulas Worksheet. In this penny lab, students determine the percent composition of a penny produced after They calculate the amount of copper and zinc in the penny by performing a chemical reaction on the penny with hydrochloric acid.
Composition of Limestone Lecture and Lab Skills Emphasized • Determining the percent composition of a compound in a substance. • Applying gravimetric analysis. In the Lab • Students will work in pairs. • Parts must be completed in order.
2. In the lab, a chemist analyzed a sample of methanol and found that it was made of g of carbon, g of Theoretical Percent Composition by Mass 8. What is the percent composition by mass for each element in sodium phosphate, Na 3 PO 4?
9. What is the percent composition by mass for each element in hydrogen peroxide, H What is. Create a mixture of different objects and calculate the percent composition of each type of object. Bring in the mixture, enclosed in a baggie, along with the percent calculations for.
Percent composition is used to find the percentage of elements in a compound. One must know the molar mass of the elements and the compound in order to get percent composition. For instance, the percent composition of oxygen in water is 89%. The molar mass of water is 18g/mol, and oxygen has a molar mass of 16g/mol.
16 divided by 18 is