chemistry

Plutonium(IV) sulfate

Plutonium(IV) sulfate 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 Plutonium(IV) sulfate rather than just read about it. In short: Plutonium(IV) sulfate is an inorganic salt consisting of plutonium and sulfate ions, with the chemical formula Pu(SO4)2·xH2O. It has been observed as a tetrahydrate, where x=4, as well as an anhydrous form, where x=0.

Key takeaways

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

Reference excerpt

Plutonium(IV) sulfate is an inorganic salt consisting of plutonium and sulfate ions, with the chemical formula Pu(SO4)2·xH2O. It has been observed as a tetrahydrate, where x=4, as well as an anhydrous form, where x=0. The tetrahydrate has been used as a primary standard for plutonium.

In aqueous solution Aqueous plutonium(IV) sulfate is produced when plutonium(IV) ions react with bisulfate or sulfate.

Pu4+(aq) + 2 HSO−4(aq) → Pu(SO4)2(aq) + 2 H+(aq) Pu4+(aq) + 2 SO2−4(aq) → Pu(SO4)2(aq)

Reactions At high temperatures, plutonium(IV) sulfate tetrahydrate decomposes. It first releases its water between 85 °C and 535 °C to eventually form anhydrous plutonium(IV) sulfate. Anhydrous plutonium(IV) sulfate decomposes between 605 °C and 810 °C to produce plutonium(IV) oxide. During decomposition of plutonium(IV) sulfate, it releases hazardous sulfur oxides. At normal temperatures, however, plutonium(IV) sulfate tetrahydrate is stable in air, even at high humidity.

Structure In plutonium(IV) sulfate tetrahydrate, the sulfate and water ligands are monodentate, with bonds between the plutonium atoms and the oxygen atoms in water and sulfate. Each plutonium atom has a coordination number of 8, and a coordination geometry of square antiprismatic. Plutonium(IV) sulfate tetrahydrate crystals have an orthorhombic crystal structure. Hydrogen bonds exist between hydrogen atoms in the water molecules and oxygen atoms in the sulfate ions that are not attached to the plutonium atom.

Polymorphs Plutonium(IV) sulfate tetrahydrate has two polymorphs– α-Pu(SO4)2·4H2O and β-Pu(SO4)2·4H2O. The two forms share the same molecular geometry, but differ in the functional nature of the hydrogen bonds. The α-form transitions into the β-form at ~120°C. α-Pu(SO4)2·4H2O has a unit cell with dimensions a=26.53Å, b=12.00Å, and c=5.69Å, where there are 8 formula units per unit cell. β-Pu(SO4)2·4H2O has a unit cell with dimensions a=14.54Å, b=10.98Å, and c=5.67Å, where there are 4 formula units per unit cell.

Hazards Plutonium(IV) sulfate is a highly dangerous compound, due to it being radioactive and carcinogenic.

References

Worked examples

Example 1 — a first encounter with Plutonium(IV) sulfate

Start with the simplest possible case. Write down what Plutonium(IV) sulfate 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 Plutonium(IV) sulfate 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 Plutonium(IV) sulfate 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 Plutonium(IV) sulfate

In research: Plutonium(IV) sulfate 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 Plutonium(IV) sulfate 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: Plutonium(IV) sulfate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Orthorhombic crystals, Plutonium(IV) compounds, Sulfates, so understanding it makes those chapters shorter.
In everyday life: Look for Plutonium(IV) sulfate 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 Plutonium(IV) sulfate in 20 minutes

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

Frequently asked questions

What is Plutonium(IV) sulfate in simple terms?

Why does Plutonium(IV) sulfate 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 Plutonium(IV) sulfate?

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 Plutonium(IV) sulfate.