The document outlines a procedure for confirming the presence of silver ions (Ag+) by dissolving solid residue in 6 M NH3 and then re-precipitating silver chloride (AgCl) using 6 M acid. It details the steps for preparing the solution, including centrifugation and acidification. The formation of a white precipitate indicates the successful detection of Ag+.

1. B. Confirmation of Silver
(Ag+)
Silver forms a soluble complex
ion with aqueous ammonia. The
presence of silver is confirmed
by dissolving any remaining
solid residue in 6 M NH3 (aq)
and then re-precipitating the
chloride by freeing the silver
ion from the complex ion using
6 M acid
Two solids together*****
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Add ~5 drops of 6 M NH3 (aq) to the solid from A, keeping your
test tube near the inlet of the fume exhaust vent. The solid should
dissolve, but if any precipitate remains, centrifuge and proceed
using only the centrifugate. Add 6 M HNO3 to the solution until
the solution is acidified, using pH indicator paper to test for
acidification. A white precipitate (AgCl) confirms the presence of
Ag+. The Cl- needed for precipitation will be present from the
prior dissolution of AgCl