chemistry

Thulium(III) chloride

Thulium(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 Thulium(III) chloride rather than just read about it. In short: Thulium(III) chloride or thulium trichloride is as an inorganic salt composed of thulium and chlorine with the formula TmCl3. It forms yellow crystals.

Key takeaways

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

Reference excerpt

Thulium(III) chloride or thulium trichloride is as an inorganic salt composed of thulium and chlorine with the formula TmCl3. It forms yellow crystals. Thulium(III) chloride has the YCl3 (AlCl3) layer structure with octahedral thulium ions. It has been used as a starting material for some exotic nanostructures prepared for NIR photocatalysis.

Preparation Thulium(III) chloride can be obtained by reacting thulium(III) oxide or thulium(III) carbonate and ammonium chloride:

Tm2O3 + 6 NH4Cl → 2 TmCl3 + 6 NH3 + 2 H2O The hexahydrate of thulium(III) chloride can be obtained by adding thulium(III) oxide to concentrated hydrochloric acid.

2 Tm + 6 HCl → 2 TmCl3 + 3 H2 Thulium(III) chloride can also be obtained by directly reacting thulium and chlorine:

2 Tm + 3 Cl2 → 2 TmCl3

Properties Thulium(III) chloride is a light yellow powder. Its hexahydrate is a light green hygroscopic solid. Both are soluble in water. Thulium(III) chloride has a monoclinic crystal structure with the space group C2/m (No. 12) corresponding to that of aluminum(III) chloride. Thulium(III) chloride reacts with strong bases to make thulium(III) oxide.

References

Illustrations

Worked examples

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

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

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

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

Frequently asked questions

What is Thulium(III) chloride in simple terms?

Thulium(III) chloride or thulium trichloride is as an inorganic salt composed of thulium and chlorine with the formula TmCl3. It forms yellow crystals.

Why does Thulium(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 Thulium(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 Thulium(III) chloride.