Anachem Experiment 2 Flashcards by Kyra Catedral

What are the 7 group 3 cations

iron
cobalt
nickel
aluminum
manganese
zinc
chromium

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group 3 cations are precipitated in a solution containing…

Ammonia, ammonium chloride, ammonium sulfide

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Precipitate is a mixture of

sulfides and hydroxides

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Soluble group 3 cations

Chromium
Zinc
Aluminum hydroxides

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Insoluble group 3 cations

Manganese
Iron
Nickel
Cobalt

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ammonia

NH4OH

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ammonium chloride

NH4Cl

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ammonium sulfide

(NH4)2S

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Makes the solution basic

3F KOH (Potassium Hydroxide)

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If all precipitate dissolved, it indicates..

Absence of Ni and Co (Nickel and Cobalt)

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Color of ALUMINUM ION precipitate

RED

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Red precipitate

ALUMINUM or NICKEL

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Color of CHROMIUM ION

Blue color w/c fades rapidly

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Blue color w/c fades rapidly

CHROMIUM ION

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Color of ZINC ION

White precipitate

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White precipitate

ZINC ION

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Color of MANGANESE ION

Reddish- Purple

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Reddish- purple

MANGANESE ION

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Color of FERRIC ION

Deep red

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Deep red

Color of FERRIC ION

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color of COBALT ION

Blue-green

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Blue green

Color of COBALT ION

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Color of NICKEL ION

Red precipate

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In the third day of analysis, what is used to determine the insoluble group 3 cations

Precipitate

What is the first procedure in day 3?

Wash with 10 drops of distilled water

What is used to dissolve the precipitate in the 3rd day of analysis?

HCL

In the 3rd day of analysis how many drops of water is used to dilute the solution

25 drops

In the 3rd day of analysis, what are the 4 ions to be detected?

Manganese Ferric Nickel Cobalt

What is added to determine Manganese ion?

Solid sodium bismuthate BiNaO3

What is added to determine presence of Ferric ion?

2 drops of 3M NH4CNS

What is added to determine the presence of Cobalt ion?

solid Sodium Fluoride NaF

In the 3rd day of analysis, what is added to make the solution basic?

3M NH4OH

What is added to determine the presence of Nickel ion

4 drops of dimethylglyoxime

First Day: Precipitating Agents of Group 3 Cations

Ammonium Chloride, Ammonia and Thioacetamide Solution

First Day: Precipitates of Group 3 Cations

FeS, ZnS, MnS, CoS, NiS, Al(OH)3, Cr(OH)3

First Day: What is the second step in experiment 2 Group 3 cations

Dissolve Everything in Solution using dilute acids

First Day: What is the purpose to dilute the solution using dilute acids?

To dissolve ferric, aluminum, chromic, nickelous, zinc, and manganous ions. CoS and NiS remains undissolved

First Day: Reagent Added to dissolve CoS and NiS

HNO3

First Day: Third Step precipitating agents

sodium peroxide, potassium hydroxide

First Day: Is the centrifugate soluble or insoluble?

soluble

First Day: Is the precipitate soluble or insoluble

insoluble

First Day: Third Step MnO(OH)2 color of precipitate

brown

First Day: Third Step Fe(H2O)3(OH)3

(reddish-brown precipitate)

First Day: Third Step Co(H2O)3(OH)3

First Day: Third Step Ni(H2O)4(OH)2

green gelatinous precipitate

Second day: Separation of Aluminum. Precipitating agent?

saturated ammonium chloride and dilute acetic acid

Second day FOURTH STEP: Precipitating agent saturated ammonium chloride and dilute acetic acid Purpose?

Precipitate aluminum ion [Al(H2O)3(OH)3(colorless gelatinous precipitate)] leaving the zinc and chromic ions in the solution

Second day FOURTH STEP: Confirmation for Aluminum ion: Reagent?

Aluminon

Second day FOURTH STEP: Reaction?

: the red colored dye will be adsorbed by the gelatinous colorless precipitate if aluminum is present thus giving a cranberry red/pink colored precipitate

FIFTH STEP: Separation of Zinc and Chromate ions (centrifugate) Precipitating agent?

Barium Acetate

FIFTH STEP: Separation of Zinc and Chromate ions (centrifugate) Precipitating agent: Barium Acetate Purpose?

Precipitate chromate ion as yellow precipitate but together with barium sulfate a white precipitate

FIFTH STEP: Separation of Zinc and Chromate ions (centrifugate) Precipitating agent: Barium Acetate Chemical Reaction?

Ba2+ + CrO4^-2↔BaCrO4

FIFTH STEP: Separation of Zinc and Chromate ions (centrifugate) Confirmation for Chromate ion: Reagent:

Hydrochloric acid (dissolve the precipitate and separate the barium sulfate) Hydrogen peroxide – formation of blue-colored perchromate

FIFTH STEP: Separation of Zinc and Chromate ions (centrifugate) Confirmation for Zinc ion (centrifugate part) Reagent?

Dilute acetic acid to neutralize ammonia leaving the zinc ions free Zn(NH3)4^2+ + 4HAc ↔Zn^2+ + 4NH4+ + 4Ac

Third day SIXTH STEP:

Addition of hydrochloric acid to dissolve the hydroxide precipitatesto make ions in free state (ionic form)

Third day SIXTH STEP: Confirmation for Manganese ion Reagents:

sodium bismuthate

Third day SIXTH STEP:Confirmation for Ferric ion Reagents:

ammonium thiocyanate

Third day SIXTH STEP: Confirmation for Cobaltous ion Reagents:

alcoholic ammonium thiocyanate

Third day SIXTH STEP: Confirmation for Nickelous ion Reagents:

ammonia and dimethylglyoxime