Chem lab 8 - Determining the Amount of Zinc Coating on...

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Determining the Amount of Zinc Coating on Copper Nails Introduction. In this experiment, the amount of zinc coating on copper nails was determined to see if a company was charging the right amount to coat the nails. This was determined by measuring the mass lost by the nails after putting them in an acid solution (gravimetric analysis), and by measuring the volume of H 2 gas evolved (gasometric analysis) during the same reaction. To see how close the two different method’s results were to each other, percent difference calculations were performed. As more trials were performed, the results from each method had lower percent differences. Experimental Procedure. Initially, one nail was weighed to the nearest 0.0001g on an analytical balance. Next, the experimental apparatus was constructed. It consisted of a 125mL Erlenmeyer flask with rubber tubing connecting to the opening of an inverted graduated cylinder inside a 600mL beaker filled with DI water. The Erlenmeyer flask and the graduated cylinder were both clamped to ring stands. Twenty milliliters of 6 M HCl was added to the flask, and a stopper was placed in the flask. The glass plug was then removed, the nail was dropped in, the plug was put
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Chem lab 8 - Determining the Amount of Zinc Coating on...

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