Chemical Reaction and Precipitation of Ferrous Oxalate

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Questions and Answers

What is the product of the reaction in Eq. 1?

H2SO4
Fe(NH4)2(SO4)2.6H2O
K2C2O4
FeC2O4 (correct)

What is the purpose of adding potassium oxalate solution?

To facilitate the oxidation of ferrous ion to ferric ion (correct)
To increase the pH of the solution
To reduce the oxidation of ferrous ion
To precipitate out the ferric hydroxide

What is the net result of Eq. 2?

H2O + HO2- + 2e- → 3OH-
2Fe2+ → 2Fe3+ + 2e-
Fe2+ + H2O → Fe3+ + OH-
2Fe2+ + H2O + HO2- → 2Fe3+ + 3OH- (correct)

What is the product of the reaction in Eq. 3?

Fe(OH)3 (A) Signup and view all the answers

What is the purpose of adding more H2C2O4?

To dissolve the ferric hydroxide (C) Signup and view all the answers

What is the final product of the series of reactions?

K3[Fe(C2O4)3].3H2O (D) Signup and view all the answers

Why is alcohol added to the solution?

To cause the complex iron salt to precipitate (A) Signup and view all the answers

What is the purpose of this laboratory experiment?

To synthesize potassium tris(oxalato)ferrate(III) trihydrate (C) Signup and view all the answers

What is the molar mass of Fe(NH4)2(SO4)2.6H2O?

392.13 g/mol (C) Signup and view all the answers

What is the name of the compound synthesized in this experiment?

Potassium tris(oxalato)ferrate(III) trihydrate (C) Signup and view all the answers

What is the concentration of oxalic acid used in this experiment?

10% oxalic acid (B) Signup and view all the answers

Why should the complex synthesized not be exposed to light?

Because it is photosensitive (D) Signup and view all the answers

What is the name of the equipment used for filtration in this experiment?

Buchner funnel (C) Signup and view all the answers

What should be worn during the experiment to ensure safety?

Safety goggles (C) Signup and view all the answers

What should be done to the crystals obtained at the end of the experiment?

Store them in a sample bottle/vial wrapped in foil (A) Signup and view all the answers

What is the chemical formula of the ferrous ammonium sulfate used in the experiment?

Fe(NH4)2(SO4)2. 6H2O (B) Signup and view all the answers

What is the role of oxalic acid in the experiment?

To form a precipitate with the ferrous ammonium sulfate (C) Signup and view all the answers

What is the purpose of heating the solution?

To facilitate the separation of the precipitate from the solution (A) Signup and view all the answers

What is the role of potassium oxalate in the experiment?

To add a basic solution to the reaction (A) Signup and view all the answers

What is the formula of the soluble complex formed in the reaction?

K3[Fe(c2o4)3]. 3H20 (B) Signup and view all the answers

What is the purpose of adding ethanol to the solution?

To cause the complex iron salt to precipitate (D) Signup and view all the answers

What is the term for the neutral metal atom that reacts with neutral molecules to form a coordination compound?

Lewis acid (B) Signup and view all the answers

What is the term for the molecules that react with the Lewis acid to form a coordination compound?

Ligands (A) Signup and view all the answers

What is the byproduct of sodium thiosulphate reacting with acid?

Colloidal sulphur (A) Signup and view all the answers

What is the role of sodium thiosulphate in water treatment?

To remove chlorine from water (B) Signup and view all the answers

What is the product of sodium thiosulphate reacting with chlorine?

Sodium sulphate (A) Signup and view all the answers

What is sodium thiosulphate used for in the medical field?

As an antidote for cyanide poisoning (A) Signup and view all the answers

What is the product of sodium thiosulphate decomposition?

Sodium polysulfide and sodium sulphate (D) Signup and view all the answers

What is the use of sodium thiosulphate in photography?

As a fixing agent (C) Signup and view all the answers

What is another application of sodium thiosulphate?

As a cleaning agent (B) Signup and view all the answers

What is the reaction of sodium thiosulphate with hydrogen chloride?

Na2S2O3 + 2HCl → 2NaCl + H2O + SO2 + S (B) Signup and view all the answers

What is the primary use of sodium thiosulphate in the textile industry?

Removing undesired dyes and stains (D) Signup and view all the answers

What role does sodium thiosulphate play in certain chemical reactions?

Chlorine scavenger (C) Signup and view all the answers

What is a potential health effect of direct contact with sodium thiosulphate?

Skin and eye irritation (D) Signup and view all the answers

What should be worn when handling sodium thiosulphate to avoid potential health risks?

Protective gloves and safety eyewear (D) Signup and view all the answers

What is a recommended precaution when handling significant amounts of sodium thiosulphate?

Operating in a well-ventilated location or wearing suitable respiratory protection (B) Signup and view all the answers

What is a potential reaction some people may experience when exposed to sodium thiosulphate?

Sensitization or allergic reactions (D) Signup and view all the answers

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Study Notes

Synthesis of Potassium Tris(oxalato)ferrate(III) Trihydrate

The reaction involves the conversion of ferrous ammonium sulfate, Fe(NH4)2(SO4)2.6H2O, to potassium tris(oxalato)ferrate(III) trihydrate, K3[Fe(C2O4)3].3H2O.
The reaction occurs in several steps:
- Fe(NH4)2(SO4)2.6H2O + H2C2O4 → FeC2O4(s) + H2SO4 + (NH4)2SO4 + 6H2O
- FeC2O4 + K2C2O4 + H2O2 → Fe(OH)3(s) + ...
- Fe(OH)3 + H2C2O4 → K3[Fe(C2O4)3].3H2O + ...
The reaction involves the oxidation of ferrous ion to ferric ion by hydrogen peroxide, and the formation of ferric hydroxide, which then reacts with oxalic acid to form the complex iron salt.

Safety Precautions

All chemicals are toxic and should be handled with care.
Organic solvents are highly flammable and can be irritating to body tissues and the respiratory tract.
Acids are corrosive, and safety goggles should be worn.
Hands should be washed thoroughly with soap and water after handling chemicals.

Apparatus

Balance
Erlenmeyer flask
Measuring cylinder
Beakers
Glass rod
Ice bath
Bunsen burner
Tripod and stand
Thermometer
Buchner funnel
Vacuum filtration apparatus
Filter paper

Chemicals

Ferrous ammonium sulfate, Fe(NH4)2(SO4)2.6H2O
Oxalic acid, H2C2O4
Potassium oxalate, K2C2O4
Hydrogen peroxide, H2O2
Ethanol
Deionized water

Procedure

The procedure involves several steps, including the preparation of the starting material, the addition of oxalic acid, and the oxidation of the ferrous ion to ferric ion.
The complex iron salt is then formed by reacting the ferric hydroxide with oxalic acid.

Useful Molar Masses

K2C2O4 = 166.22 g/mol
Fe(NH4)2(SO4)2.6H2O = 392.13 g/mol
K3[Fe(C2O4)3].3H2O = 491.24 g/mol

Coordination Compounds

Coordination compounds are formed when a neutral metal atom or a metallic cation reacts with neutral molecules or anions.
Lewis acids are electron pair acceptors, and Lewis bases are electron pair donors.
The reaction between ferrous ammonium sulfate and oxalic acid is an example of a coordination compound formation.

Sodium Thiosulfate

Sodium thiosulfate is a chemical compound that can be used to dechlorinate water.
It interacts with chlorine to produce sodium sulfate and harmless chloride ions.
Sodium thiosulfate is used in the development and fixing of photographic films.
It is used as an antidote for cyanide poisoning.
It is used in the treatment of water, textile industry, and as a cleaning agent.

Health Hazards and Precaution

Direct contact with sodium thiosulfate may cause skin and eye irritation.
Inhaling sodium thiosulfate dust or fumes may cause respiratory discomfort.
Some people may experience sensitization or allergic reactions to sodium thiosulfate.

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