Question

The lab is for CHEM II and it is taken out of a lab paq. Beloware the materials used.

Classify your ions according to the following three groups.

Several of the cations belong to more

than one group.

Group 1: Anions that WILL NOT PRECIPITATE in the presence of

silver nitrate.

Group 2: Anions that WILL PRECIPITATE in the presence ofsilver

nitrate and the resulting

precipitates WILL DISSOLVE upon acidification with nitric

acid.

Group 3: Anions that WILL PRECIPITATE in the presence ofsilver

nitrate and the resulting

precipitates WILL NOT DISSOLVE upon acidification withnitric

acid.

A. Write a net ionic equation for any reaction that producesa

precipitate.

B. Identify the anions that produce gas upon addition of

HCl.

C. Identify the anions that do not precipitate with silver

nitrate.

D. Identify the anions that react with silver nitrate toform

precipitates that dissolve when

acidified with nitric acid.

E. Identify the anions that react with silver nitrate toform

precipitates that do not dissolve when

acidified with nitric acid.

F. What simple test (other than a specific confirmationtest)

would distinguish between CO3 2-

and NO3 - ?

Here are the materials we used

1 Ammonium Molybdate, 0.2 M - 2 mL in Pipet

1 Aqueous Ammonia, 6 M, NH4OH - 4 mL in Pipet

1 Barium Chloride, 0.3 M - 2 mL in Pipet

1 Hydrochloric Acid, 6 M - 8 mL in Dropper Bottle

1 Nitric Acid, 6 M - 2.5 mL in Pipet

1 Organic Reagent - 1.5 mL in Vial

2 Pipet, Empty Short Stem

1 Silver Nitrate, 0.1 N - 6 mL in White Dropper

Bottle

1 Sodium Bromide, 0.1 M - 2.5 mL in Pipet

1 Sodium Carbonate, 0.25 M - 2.5 mL in Pipet

1 Sodium Chloride, 0.1 M - 2.5 mL in Pipet

1 Sodium Iodide, 0.1 M - 2.5 mL in Pipet

1 Sodium Phosphate, 0.1 M - 2.5 mL in Pipet

1 Sodium Sulfate, 0.1 M - 2.5 mL in Pipet

1 Sodium Sulfide, 0.1 M - 2.5 mL in Pipet

1 Unknown - 5 mL in Pipet