chemistry

Holmium(III) chloride

Holmium(III) chloride 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 Holmium(III) chloride rather than just read about it. In short: Holmium(III) chloride is the inorganic compound with the formula HoCl3. It is a common salt but is mainly used in research.

Key takeaways

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

Reference excerpt

Holmium(III) chloride is the inorganic compound with the formula HoCl3. It is a common salt but is mainly used in research. It can be used to produce pure holmium. It exhibits the same color-changing behavior seen in holmium oxide, being a yellow in natural lighting and a bright pink color in fluorescent lighting.

Preparation The most commonly used method to obtain holmium(III) chloride involves heating a mixture of holmium(III) oxide and ammonium chloride at 200-250 °C:

Ho2O3 + 6 NH4Cl → 2 HoCl3 + 6 NH3 + 2 H2O The hexahydrate of holmium(III) chloride can be obtained by reaction between holmium and hydrochloric acid:

2 Ho + 6 HCl → 2 HoCl3 + 3 H2 It can also be prepared by the direct reaction between holmium and chlorine:

2 Ho + 3 Cl2 → 2 HoCl3

Properties Holmium(III) chloride and its hexahydrate are light yellow solids in daylight that are soluble in water. The hexahydrate starts to release water of crystallization at 64 °C. Holmium(III) chloride has a monoclinic crystal structure analogous to that of aluminum(III) chloride. In the solid state it has the YCl3 layer structure.

References

Illustrations

Worked examples

Example 1 — a first encounter with Holmium(III) chloride

Start with the simplest possible case. Write down what Holmium(III) chloride 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 Holmium(III) chloride 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 Holmium(III) chloride 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 Holmium(III) chloride

In research: Holmium(III) chloride 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 Holmium(III) chloride 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: Holmium(III) chloride is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chlorides, Holmium compounds, Lanthanide halides, so understanding it makes those chapters shorter.
In everyday life: Look for Holmium(III) chloride 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 Holmium(III) chloride in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Holmium(III) chloride 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 Holmium(III) chloride out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Holmium(III) chloride in simple terms?

Holmium(III) chloride is the inorganic compound with the formula HoCl3. It is a common salt but is mainly used in research.

Why does Holmium(III) chloride 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 Holmium(III) chloride?

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 Holmium(III) chloride.