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My question reads as follows:

"What's the most useful reagent for the gravimetric analysis of silver from the options below: A. Sodium nitrate B. Barium carbonate C. Potassium sulphate D. Ammonium chloride"

I can rule out A and C as they do not form a silver precipitate with a solution containing silver. However, both B and D can form a silver precipitate so I am not sure which of them would be the most useful.

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You are missing something: before you even put the silver in, NH4Cl is soluble, while BaCO3 has already precipitated (insoluble)!

This means that Cl- will precipitate more completely with NH4Cl. Therefore, D.

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  • $\begingroup$ Don't know how I didn't see that. Thanks anyway. $\endgroup$ – Reinhild Van Rosenú Sep 5 '16 at 22:15

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