chemistry

Holmium(III) sulfide

Holmium(III) sulfide 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) sulfide rather than just read about it. In short: Holmium(III) sulfide is the sulfide salt of holmium, with the chemical formula of Ho2S3. Preparation Holmium(III) sulfide can be obtained by the reaction of holmium(III) oxide and hydrogen sulfide at 1325 °C.

Key takeaways

Holmium(III) sulfide 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) sulfide to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Holmium(III) sulfide from memory before moving on to harder problems.

Reference excerpt

Holmium(III) sulfide is the sulfide salt of holmium, with the chemical formula of Ho2S3.

Preparation Holmium(III) sulfide can be obtained by the reaction of holmium(III) oxide and hydrogen sulfide at 1325 °C.

Ho2O3 + 3 H2S → Ho2S3 + 3 H2O It can also be prepared by treating holmium(III) sulfate with hydrogen sulfide at elevated temperatures. In another preparation, it can be produced by treating metallic holmium with sulfur:

2Ho + 3S → Ho2S3 Once prepared, holmium(III) sulfide can be purified by chemical vapor transport using iodine.

Properties Holmium(III) sulfide has orange-yellow crystals in the monoclinic crystal system, with the space group P21/m (No. 11). Under high pressure, holmium(III) sulfide can form in the cubic and orthorhombic crystal systems.

References

Illustrations

Worked examples

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

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

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

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

Frequently asked questions

What is Holmium(III) sulfide in simple terms?

Holmium(III) sulfide is the sulfide salt of holmium, with the chemical formula of Ho2S3. Preparation Holmium(III) sulfide can be obtained by the reaction of holmium(III) oxide and hydrogen sulfide at 1325 °C.

Why does Holmium(III) sulfide 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) sulfide?

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) sulfide.