How to calculate the thickness of zinc coating in a galvanized sheet?
A piece of galvanized sheet metal was obtained from the instructor. After being instructed on how to properly measure lengths using vernier calipers, we proceeded to measure the length and width of our rectangular piece of sheet metal to the nearest 0.01 cm. Using the digital scale, we then measured the mass of the piece of metal to the nearest 0.01 g. Ten milliliters of 6 M hydrochloric acid was obtained from the container supplied by the instructor. This was done wearing chemical resistant gloves, and the chemical was carefully poured into our 25-mL graduated cylinder, using the stirring rod to guide the liquid. The piece of sheet metal was placed into a 200-mL beaker, and then the acid was added from the graduated cylinder. Once the bubbling slowed significantly, we removed the piece of sheet metal and rinsed it off under running water for about a half minute. The piece of metal was then thoroughly dried and weighed once again on the digital scale. Finally, the acid in the beaker wa
