To monitor the thickness of silver layers deposited during an industrial process

Question

To monitor the thickness of silver layers deposited during an industrial process, a gravimetric analysis was carried out for silver. A sample with known surface area was soaked in 20% nitric acid for 24 hours. KCl was then added to the solution, and the AgCl produced was filtered with a preweighed glass-microfiber filter. The precipitate on the filter was then dried at 60 degrees for 2 hours. If teh sample has a surface area of 1cm2, and the layer is 2m thick, how much AgCl would be expected to precipitate? (Ag = 10.49)

Explanation / Answer

Volume = surface area x thickness = 1 x 0.0002 = 2 x 10^-4 cm^3

pAg = 10.49

[Ag] = 3.236 x 10^-11 M

AgCl expected to be precipitated = (3.236 x 10^-11/1000) x 143.32 x 2 x 10^-4 = 9.27 x 10^-13 g

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