chemistry

Uranyl acetate

Uranyl acetate 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 Uranyl acetate rather than just read about it. In short: Uranyl acetate is the acetate salt of uranium oxide, a toxic yellow-green powder useful in certain laboratory tests. Structurally, it is a coordination polymer with formula UO2(CH3CO2)2(H2O)·H2O.

Key takeaways

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

Reference excerpt

Uranyl acetate is the acetate salt of uranium oxide, a toxic yellow-green powder useful in certain laboratory tests. Structurally, it is a coordination polymer with formula UO2(CH3CO2)2(H2O)·H2O.

Structure

In the polymer, uranyl (UO22+) centers are bridged by acetate ligands. The remainder of each (heptacoordinate) coordination sphere is provided by an aquo ligand and a bidentate acetate ligand. One water of crystallization occupies the lattice. Uranyl carboxylates are known for diverse carboxylic acids (formate, butyrate, acrylate).

Uses Uranyl acetate is extensively used as a negative stain in electron microscopy. Most procedures in electron microscopy for biology require the use of uranyl acetate. Negative staining protocols typically treat the sample with 1% to 5% aqueous solution. Uranyl acetate staining is simple and quick to perform and one can examine the sample within a few minutes after staining. Some biological samples are not amenable to uranyl acetate staining and, in these cases, alternative staining techniques and or low-voltage electron microscopy technique may be more suitable. 1% and 2% uranyl acetate solutions are used as an indicator, and a titrant in stronger concentrations in analytical chemistry, as it forms an insoluble salt with sodium (the vast majority of sodium salts are water-soluble). Uranyl acetate solutions show evidence of being sensitive to light, especially UV, and will precipitate if exposed. Uranyl acetate is also used in a standard test—American Association of State Highway and Transportation Officials (AASHTO) Designation T 299—for alkali-silica reactivity in aggregates (crushed stone or gravel) being considered for use in cement concrete. Uranyl acetate dihydrate has been used as a starting reagent in experimental inorganic chemistry.

Preparation and reactions The compound can be prepared by treating uranium trioxide with acetic acid:

UO3 + 2 CH3COOH + H2O → UO2(CH3COO)2·2H2O The acetate ligands of uranyl acetate can be replaced to give a variety of uranyl complexes. Uranyl acetate can also be reduced by zinc to give the uranium(IV) acetate (U(OAc)4).

Safety In general, uranium salts exhibit nephrotoxicity. Normal commercial stocks from depleted uranium have typical specific activity 0.37–0.51 microcuries per gram (14–19 kBq/g), too weak to harm from outside the body. However, uranyl acetate is very toxic if ingested, inhaled as dust, or absorbed through cut or abraded skin. Microbiologists have developed a number of alternative stains: neodymium acetate, platinum blue, hafnium chloride, and oolong tea extracts.

References

Illustrations

Worked examples

Example 1 — a first encounter with Uranyl acetate

Start with the simplest possible case. Write down what Uranyl acetate 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 Uranyl acetate 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 Uranyl acetate 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 Uranyl acetate

In research: Uranyl acetate 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 Uranyl acetate 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: Uranyl acetate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Acetates, Coordination polymers, Electron microscopy stains, so understanding it makes those chapters shorter.
In everyday life: Look for Uranyl acetate 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Uranyl acetate” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Uranyl acetate in 20 minutes

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

Frequently asked questions

What is Uranyl acetate in simple terms?

Uranyl acetate is the acetate salt of uranium oxide, a toxic yellow-green powder useful in certain laboratory tests. Structurally, it is a coordination polymer with formula UO2(CH3CO2)2(H2O)·H2O.

Why does Uranyl acetate 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 Uranyl acetate?

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 Uranyl acetate.