chemistry

Nickel(II) bromide

Nickel(II) bromide is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Nickel(II) bromide rather than just read about it. In short: Nickel(II) bromide is the name for the inorganic compounds with the chemical formula NiBr2(H2O)x. The value of x can be 0 for the anhydrous material, as well as 2, 3, or 6 for the three known hydrate forms.

Key takeaways

Nickel(II) bromide belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Nickel(II) bromide to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Nickel(II) bromide from memory before moving on to harder problems.

Reference excerpt

Nickel(II) bromide is the name for the inorganic compounds with the chemical formula NiBr2(H2O)x. The value of x can be 0 for the anhydrous material, as well as 2, 3, or 6 for the three known hydrate forms. The anhydrous material is a yellow-brown solid which dissolves in water to give blue-green hexahydrate (see picture).

Structure The structure of the nickel bromides varies with the degree of hydration. In all of these cases, the nickel(II) ion adopts an octahedral molecular geometry. Similar structures are observed in aqueous solutions of nickel bromide.

Anhydrous NiBr2 adopts the hexagonal cadmium chloride structure. The interatomic distance for Ni-Br is 2.52—2.58 Å. Anhydrous NiBr2 is a paramagnet at room temperature. Upon cooling, it turns into an antiferromagnet at 52 K, and then into a helimagnet at 22.8 K. The structure of the trihydrate has not been confirmed by X-ray crystallography. It is assumed to adopt a chain structure. The di- and hexahydrates adopt structures akin to those for the corresponding chlorides. The dihydrate consists of a linear chain, whereas the hexahydrate features isolated trans-[NiBr2(H2O)4] molecules together with two water molecules of crystallization.

Reactions and uses NiBr2 has Lewis acid character, as indicated by its tendency to hydrate and form adducts with a variety of other Lewis bases. NiBr2 is also used to prepare catalysts for cross-coupling reactions and various carbonylations. NiBr2-glyme shows increased activity compared to NiCl2-glyme for some transformations.

References

Cited sources Haynes, William M., ed. (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. ISBN 9781498754293.

Illustrations

Worked examples

Example 1 — a first encounter with Nickel(II) bromide

Start with the simplest possible case. Write down what Nickel(II) bromide claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Nickel(II) bromide before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Nickel(II) bromide ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Nickel(II) bromide

In research: Nickel(II) bromide appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Nickel(II) bromide in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Nickel(II) bromide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bromides, Metal halides, Nickel compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Nickel(II) bromide outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Nickel(II) bromide in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Nickel(II) bromide means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Nickel(II) bromide out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Nickel(II) bromide in simple terms?

Why does Nickel(II) bromide matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Nickel(II) bromide?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Nickel(II) bromide.