Cobalt II Sulfate Formula, Structure, Properties, Uses

Cobalt II Sulfate Formula: Cobalt II Sulfate Formula is CoSO4. Its is used in electroplating and as a catalyst in chemical reactions

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Cobalt II Sulfate Formula Structure

Cobalt II Sulfate Formula: Cobalt(II) sulfate, alternatively known as cobaltous sulfate or cobalt sulfate, is classified as a hazardous metallic salt. This inorganic compound possesses the chemical formula CoSO4 or CoO4S and comprises cobalt in a +2 oxidation state, combined with sulfate in a 1:1 ratio. It presents as a scentless, rose-pink solid, which readily submerges and dissolves in boiling water. Cobalt(II) sulfate exhibits different hydrate forms, including heptahydrate, hexahydrate, and monohydrate. Among these, the heptahydrate variant is the most commonly accessible form of cobalt salt. It demonstrates insolubility in ammonia and solubility in methanol.

Upon heating to 735 °C, it decomposes, releasing toxic sulfur oxide fumes. This compound finds utility in various applications, such as pigment manufacturing, catalysis, as a drying agent in paint and ink, and as a soil amendment. Additionally, it serves as a supplement for addressing Vitamin B12 deficiency and is utilized in storage batteries. It is important to note that exposure to cobalt(II) sulfate can lead to irritation in the eyes, skin, and respiratory tract, with potential effects on the lungs, heart, and kidneys.

Cobalt II Sulfate Formula Structure

Cobalt (II) Sulfate has the chemical formula CoSO4 or CoO4S. Its structure consists of a cobalt ion (Co²⁺) bonded to a sulfate ion (SO₄²⁻) in a 1:1 ratio.

Cobalt II Sulfate Formula Structure

Cobalt II Sulfate Formula Physical Properties

Below are the physical properties of Cobalt II Sulfate like chemical formula, IUPAC Name, Appearance, Odour, Melting Point, Molar Mass and Density.

Cobalt II Sulfate Formula Properties
Chemical formula CoSO4·(H2O)n


IUPAC Name Cobalt(II) sulfate
Appearance  Reddish crystalline (anhydrous, monohydrate) 

pink salt (hexahydrate) 

Odour  Odourless
Melting point 735 °C
Molar mass 154.996 g/mol (anhydrous)

173.01 g/mol (monohydrate)

 263.08 g/mol (hexahydrate)

 281.103 g/mol (heptahydrate)

Density  3.71 g/cm3 (anhydrous)

3.075 g/cm3 (monohydrate)

2.019 g/cm3 (hexahydrate)

1.948 g/cm3 (heptahydrate)

Cobalt II Sulfate Formula Chemical Properties

Cobalt II Sulfate Formula is CoSO4. When the temperature range rises between 600-700℃. Then Cobalt Sulfate decomposes into oxygen, sulfur dioxide and cobaltous oxide.

2CoSO4 → O2 + 2SO2 + 2CoO

When Cobalt(II) Sulfate reacts with sodium hydroxide. Then it produces sodium sulfate and Cobalt(II) hydroxide.

2NaOH + CoSO4 → Na2SO4 + Co(OH)2

When Cobalt(II) Sulfate reacts with Aluminium hydroxide. Then it produces e cobalt(II) aluminium oxide, sulfur dioxide, oxygen, and water.

4Al(OH)3 + 2CoSO4 → 2CoAl2O4 + 2SO2 + O2 + 6H2O

When Cobalt(II) Sulfate reacts with concentrated solution of ammonium hydroxide. Then  hexaamminecobalt(II) sulfate and water are produced.

6NH4OH + CoSO4 → 6H2O + [Co(NH3)6]SO4

When Cobalt(II) Sulfate reacts with lead nitrate. Then lead sulfate and cobalt(II) nitrate are produced.

CoSO4 + Pb(NO3)2 → PbSO4 + Co(NO3)2

Preparation of Cobalt (II) Sulfate 

Cobalt II Sulfate Formula is CoSO4. Cobalt (II) Sulfate can be produced. When aqueous sulfuric acid reacts with cobaltous oxide.

CoO + H2SO4 + 6H2O → CoSO4(H2O)7

Metallic cobalt, its hydroxide, or carbonate  react with aqueous sulfuric acid. Then the byproduct is Cobalt (II) Sulfate formed.

Co + H2SO4 + 7H2O → CoSO4(H2O)7 + H2

At Room Temperature, if humidity is below 70% . Then heptahydrate transforms into hexahydrate. While if temperature rises between the range of 100 and 250 °C then hexahydrate transforms into the monohydrate and anhydrous forms.

CoSO4(H2O)7 → CoSO4(H2O)6 + H2O

CoSO4(H2O)6 → CoSO4(H2O) + 5H2O

CoSO4(H2O) → CoSO4 + H2O

Uses Cobalt (II) Sulfate 

Hydrated cobalt(II) sulfate finds several valuable applications:

In the field of electroplating, it plays a vital role, helping to deposit a layer of cobalt onto various surfaces, enhancing their durability and appearance.

It contributes to the manufacturing of storage batteries, playing a part in the development of efficient energy storage solutions.

This compound acts as a catalyst in various chemical reactions, speeding up the process without being consumed in the reaction.

It is used as a drier in the production of paints and inks, facilitating their faster drying and setting.

In agriculture, it serves as a soil additive, aiding in the enrichment of soil with essential nutrients.

Interestingly, cobalt (II) sulfate is used in veterinary medicine to prevent and treat cobalt deficiency in ruminants, ensuring their overall health and well-being.

Health Hazards

While cobalt is indeed an essential mineral for mammals, excessive intake, even just a few micrograms per day, can have adverse effects.

Contact with cobalt can lead to irritation of the eyes and skin.

Inhaling cobalt can result in breathing difficulties, coughing, and potential issues with the respiratory tract.

When ingested, it may cause pain and vomiting, with the potential for harm to vital organs such as the kidneys, lungs, and heart.

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Cobalt II Sulfate Formula FAQs

What is the chemical formula for Cobalt(II) Sulfate?

The chemical formula for Cobalt(II) Sulfate is CoSO4 or CoO4S.

What does Cobalt(II) Sulfate look like?

It appears as a rose-pink solid.

Does Cobalt(II) Sulfate have an odour?

No, it is odourless.

At what temperature does Cobalt(II) Sulfate melt?

It melts at 735°C.

What is the molar mass of Cobalt(II) Sulfate?

The molar mass varies with the hydration state: 154.996 g/mol (anhydrous), 173.01 g/mol (monohydrate), 263.08 g/mol (hexahydrate), and 281.103 g/mol (heptahydrate).

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