Silver Alloy
From the mass of filtered AgCl and the mass of the silver alloy sample, calculate the mass of silver in the al
From the mass of filtered AgCl and the mass of the silver alloy sample, calculate the mass of silver in the allloy.
AgCl=.42 grams
Silver Alloy=.37 grams
I assume that 0.37 grams of silver alloy was totally dissolved in HNO3/H2SO4 solution and then the silver was precipitate as a chloride, filtered, rinsed, and dried to get the 0.42 grams of salt. You will need the atomic weights:
Molar mass of AgCl is 143.32 g/ mol http://en.wikipedia.org/wiki/Silver_chloride
Atomic weight of Ag is 107.87 g/ mol http://www.webelements.com/webelements/elements/text/Ag/key.html
Atomic weight of Cl is 35.453 g/ mol http://www.webelements.com/webelements/elements/text/Cl/key.html
Now convert grams AgCl to moles AgCl:
(0.42 grams AgCl) / (143.32 grams/mole) = 0.0029 moles AgCl
Now calculate the % of Ag in AgCl as 107.87/143.32 = 75.27% Ag
Next get the moles of Ag by (75.27%) * (0.0029 moles) = 0.0022 moles Ag
Then convert moles of Ag back to grams of Ag:
(0.0022 moles Ag) * (107.87 grams/mole) = 0.24 grams Ag
Finaly, determine the % Ag in the Alloy by
(0.24 grams Ag) / (0.37 grams alloy) = 64.30% Ag
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