1. Write chemical reaction equations to correspond to the written descriptions.

Question

1. Write chemical reaction equations to correspond to the written descriptions.

a) The formation of mercury(I) chloride precipitate from mercury(I) and chloride ions.

b) The dissolving of lead(II) chloride solid.

c) The formation of the diammine silver complex ion from silver ion andammonia

2. Consider that a lab team has been performing the same Group I analysis asis described in the procedure section. Their original solution may containfrom none to all three of the metal ions. They have made the followingobservations so far. A white precipitate formed when 6 M HCl was firstadded. Some of this precipitate appeared to dissolve when water was added
and heated. The liquid phase was poured off and K2CrO4 was added yieldinga yellow precipitate. Returning to the previous precipitate remainder, 6 M
NH3 was added to the solid dissolving it without residue. At this point,classify each of the Group I ions as confirmed, probable, or absent.

Explanation / Answer

1)

a ) Hg 2+2 (aq) + 2Cl- (aq) -----------------------> Hg2Cl2 (s)

b) PbCl2 (s) --------------------> Pb+2 (aq) + 2Cl- (aq)

c) Ag+ (aq) + 2NH3 (l) --------------------------> [Ag(NH3)2]+ (aq)

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