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18 Dec 2019

1. Silver nitrate reacts with sodium and an unknown anion. A white precipitate forms. What are the possible anion?

2. Addition of nitric acid to another sample of the same Na with unknown anion solution. The reaction produceses a colorless, ordorless gas. WHat anions are present?

3. The same sodium with unknown anion is treated with magnesium chloride, there was a white precipitate. Wht single anion is present?

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Lelia LubowitzLv2

31 Dec 2019

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Please put the following steps in order for the general procedurefor testing anions. Be sure to clean and then rinse your teststubes with distilled water before starting, when you get a freshsample of anion solution or are done for the day. To determinewhich of the three possible cations (sodium, potassium, or lithium)are in the anion unknown you must do a flame test as was done inexperiment 2.

1 2 3 4 5 Finally dispose of all used chemicals in the waste bottlefor exp. 5 in the fume hood and wash glassware.

1 2 3 4 5 To anion solutions that form a precipitate with 0.1Msilver nitrate add 0.5 mL of 6M nitric acid, observe and mixwell.

1 2 3 4 5 Test the unknown for the anion analysis (5B-xxxx) usingthe same tests and logic used for the known anion solutions.

1 2 3 4 5 Test fresh samples of anion solutions that did not reactwith 6M HCl or 0.1M barium nitrate by adding 0.5 mL of 0.1M silvernitrate, observe and mix.

1 2 3 4 5 Observe while adding 0.5 mL of 6M HCl to 1 mL samples ofthe anion solutions and then add 5 drops of 0.1M barium nitrate andobserve again.

salmonwombat608

I tried posting this question before, but I didn't get a greatanswer. Ãâ Please this is for the ANION test lab NOT the CATIONtest. Ãâ Thank you!

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

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 of silver

nitrate and the resulting

precipitates WILL DISSOLVE upon acidification with nitric

acid.

Group 3: Anions that WILL PRECIPITATE in the presence of silver

nitrate and the resulting

precipitates WILL NOT DISSOLVE upon acidification with nitric

acid.

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

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 to form

precipitates that dissolve when

acidified with nitric acid.

E. Identify the anions that react with silver nitrate to form

precipitates that do not dissolve when

acidified with nitric acid.

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

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

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