chemistry

Uranium(III) chloride

Uranium(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 Uranium(III) chloride rather than just read about it. In short: Uranium(III) chloride, UCl3, is a water soluble salt of uranium. UCl3 is used mostly to reprocess spent nuclear fuel.

Key takeaways

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

Reference excerpt

Uranium(III) chloride, UCl3, is a water soluble salt of uranium. UCl3 is used mostly to reprocess spent nuclear fuel. Uranium(III) chloride is synthesized in various ways from uranium(IV) chloride; however, UCl3 is less stable than UCl4.

Preparation There are at least two ways to synthesize uranium(III) chloride. The following processes describe how to produce uranium(III) chloride. (1) In a mixture of NaCl-KCl at 670–710 °C, add uranium tetrachloride with uranium metal.

3UCl4 + U → 4UCl3 (2) Heat uranium(IV) chloride in hydrogen gas.

2UCl4 + H2 → 2UCl3 + 2HCl

Properties In solid uranium(III) chloride each uranium atom has nine chlorine atoms as near neighbours, at approximately the same distance, in a tricapped trigonal prismatic configuration. Uranium(III) chloride is a green crystalline solid at room temperature. UCl3 melts at 837 °C and boils at 1657 °C. Uranium(III) chloride has a density of 5500 kg/m3 or 5.500 g/cm3. Its composition by weight:

Chlorine: 30.84% Uranium: 69.16% Its formal oxidative states:

Chlorine: -1 Uranium: +3 This salt is very soluble in water and is also very hygroscopic. UCl3 is more stable in a solution of hydrochloric acid.

Uses

Reagent Uranium(III) chloride is used in reactions with tetrahydrofuran (THF) and sodium methylcyclopentadiene to prepare various uranium metallocene complexes.

Catalyst Uranium(III) chloride is used as a catalyst during reactions between lithium aluminium hydride (LiAlH4) and olefins to produce alkyl aluminate compounds.

Molten form Molten uranium(III) chloride is an important component of liquid nuclear fuel used in molten-salt reactors. Neutron scattering and computational studies point to the presence of unusual heterogeneous bonding environment around U(III) at high temperatures, with distinct inner- and outer-coordination subshells. The molten form of uranium(III) chloride is also a typical compound in pyrochemical processes as it is important in the reprocessing of spent nuclear fuels. UCl3 is usually the form that uranium takes as spent fuel in electrorefining processes.

Hydrates There are at least three hydrates of uranium(III) chloride:

UCl3.2H2O.2CH3CN UCl3.6H2O UCl3.7H2O Each are synthesized by the reduction of uranium(IV) chloride in methylcyanide (acetonitrile), with specific amounts of water and propionic acid.

Precautions While there are no long-term data on the toxic effects thas UCl3, it is important to minimize exposure to this compound when possible. Similar to other uranium compounds that are soluble in water, UCl3 is likely absorbed into the blood through the alveolar pockets of the lungs within days of exposure. Exposure to uranium(III) chloride leads to toxicity of the renal system.

References

External links Uranium(III) chloride information at Webelements Uranium(III) chloride International Bio-Analytical Industries, Inc. Depleted Uranium: All the Questions about DU and Gulf War Syndrome are Not Yet Answered

Illustrations

Worked examples

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

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

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

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

Frequently asked questions

What is Uranium(III) chloride in simple terms?

Uranium(III) chloride, UCl3, is a water soluble salt of uranium. UCl3 is used mostly to reprocess spent nuclear fuel.

Why does Uranium(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 Uranium(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 Uranium(III) chloride.