This is all that is given for the problem. show and explain all work inlcuding m

Question

This is all that is given for the problem. show and explain all work inlcuding math, formulas, and charts.

The light-sensitive chemicals on photographic Mass of Added Standard Per mL of film are silver halides (i.e onic compounds made of Original Sample solutio (ug/mL) Absorbance silver and one of the halogens: fluorine, bromine, 0.32 chlorine and iodine). Thus, silver is often extracted 0.41 from photographic waste for commercial reclamation. 10 0.52 A sample of photographic waste containing an 15 0.60 unknown amount of silver was determined by standard 0.70 0.77 addition with atomic absorption spectroscopy. Data is 0.89 shown to the right. Solve for the unknown concentration using the standard addition method.

Explanation / Answer

With the total volume of the solution be 1 ml

For a solution with 5 ug/ml of standard added to make a 1 ml solution

concentration of standard (Cs) in solution = 5 ug/ml

let Cx be the unknown concentration

let Ax be absorbance when no standard is present and A be absorbance with standard (5 ug/ml)

then,

Cx/(Cx + Cs) = Ax/A

So from the calculated concentration and absorbance data,

Cx/(Cx + 5) = 0.32/0.41

0.41Cx = 0.32Cx + 1.6

Cx = 1.6/0.09

     = 17.8 ug

So, the concentration of unknown in the solution = 17.8 ug (or 18 ug)

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