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Cobalt Nitrate
Cobalt Nitrate (Product Code: SCI-648/283) is an analytical reagent grade cobalt(II) salt used as the confirmatory reagent in the charcoal-block cobalt nitrate test of dry salt analysis in school and college chemistry laboratories. Chemistry teachers and practical examiners use its solution to tell aluminium, zinc and magnesium residues apart by colour, and the salt comes in a 100 g pack with an MSDS. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India, as one of its lab chemicals for salt analysis.
Specifications
| Parameter | Detail |
|---|---|
| Chemical | Cobalt(II) nitrate (hydrate form not stated — ask us) |
| Grade | Analytical reagent |
| Capacity | 100 g |
| MSDS | Included with the supply |
| Shelf life | Shelf life depends on the chemical, its grade and storage conditions; ask us for the expiry date of the batch you are quoted. |
| Product code | SCI-648/283 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is Cobalt Nitrate Used For?
In the cobalt nitrate test, a white residue left after heating an unknown salt on a charcoal block is moistened with a drop or two of cobalt nitrate solution and heated again in the oxidising flame of a blowpipe. A blue mass points to aluminium, a green mass to zinc and a pale pink mass to magnesium, which makes this single reagent a useful step in the salt analysis scheme of school chemistry lab practicals.
Cobalt(II) solutions also show a striking colour equilibrium: pink hydrated cobalt ions turn blue when concentrated hydrochloric acid is added or the solution is warmed, and return to pink on dilution or cooling, a clear illustration of Le Chatelier's principle. Cobalt compounds are harmful, can cause skin and breathing sensitisation and are treated as possible carcinogens, so wear gloves, avoid raising dust and dispose of cobalt residues as heavy-metal waste.
Supplier
Jain Scientific Equipments Private Limited, which trades as ScienceLab, supplies Cobalt Nitrate to schools, colleges, examination centres and dealers that stock reagents for dry salt analysis. For vendor registration, the supplying company is Jain Scientific Equipments Private Limited (CIN U29309HR2020PTC087597, GSTIN 06AAECJ8618A1ZT). Further company information is on the ScienceLab profile.
Related Laboratory Equipment
Apparatus and reagents that go with cobalt nitrate in dry tests and colour demonstrations:
- Charcoal Block — holds the salt residue during the cobalt nitrate test.
- Blow Pipe — directs an oxidising flame onto the moistened residue.
- Hydrochloric Acid — shifts the pink-to-blue cobalt colour equilibrium.
- Cobalt Chloride Paper — a related cobalt reagent that changes colour with water.
- Dropper — adds the solution one drop at a time.
See the Laboratory Equipment category for other analysis reagents and apparatus.
Frequently Asked Questions
What is the cobalt nitrate test in salt analysis?
The cobalt nitrate test uses Cobalt Nitrate solution on a white residue from a charcoal-block test; after reheating in the oxidising flame, a blue mass indicates aluminium, green indicates zinc and pale pink indicates magnesium. It is a standard confirmatory step in dry salt analysis.
How much Cobalt Nitrate is in one pack?
Each pack of Cobalt Nitrate SCI-648/283 contains 100 g of analytical reagent grade salt and is supplied with an MSDS. Only a few drops of dilute solution are used per test, so tell us how many students or batches you plan for when asking for a quantity.
Why does Cobalt Nitrate solution change from pink to blue?
Cobalt Nitrate solution is pink because of hydrated cobalt(II) ions; adding concentrated hydrochloric acid or heating forms a blue chloro-cobalt complex. Diluting or cooling reverses the change, which makes it a clear classroom demonstration of chemical equilibrium.
What safety precautions apply to Cobalt Nitrate?
Cobalt Nitrate is harmful, can cause skin and breathing sensitisation, is treated as a possible carcinogen and is an oxidiser. Handle it with gloves and eye protection, avoid dust, keep it away from combustibles and collect all residues as heavy-metal waste.
What is the shelf life of Cobalt Nitrate?
Shelf life depends on the chemical, its grade and storage conditions; ask us for the expiry date of the batch you are quoted. Cobalt Nitrate should be kept tightly closed in a cool, dry place, because the crystals attract moisture from the air.
Who supplies Cobalt Nitrate for school laboratories?
Cobalt Nitrate is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India, to schools, colleges and dealers in India and international markets, in 100 g analytical reagent packs with MSDS, and it can be quoted together with charcoal blocks and blowpipes.
Request a Quote
Send code SCI-648/283 and the number of 100 g packs through the contact page, or place Cobalt Nitrate in the enquiry cart with your other salt analysis items to receive one quotation.
Last updated: 24 September 2026
