science

Tetranitratoaluminate

Tetranitratoaluminate is a science 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 Tetranitratoaluminate rather than just read about it. In short: Tetranitratoaluminate is an anion of aluminium and nitrate groups with formula [Al(NO3)4]− that can form salts called tetranitratoaluminates. It is unusual in being a nitrate complex of a light element.

Key takeaways

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

Reference excerpt

Tetranitratoaluminate is an anion of aluminium and nitrate groups with formula [Al(NO3)4]− that can form salts called tetranitratoaluminates. It is unusual in being a nitrate complex of a light element.

Related substances By substituting boron for aluminium tetranitratoborates result. Aluminium can coordinate more nitrates resulting in pentanitratoaluminates and hexanitratoaluminates. By replacing nitrate with perchlorate, the tetraperchloratoaluminate ion results.

Formation When hydrated aluminium nitrate reacts with dinitrogen pentoxide it forms a nitronium salt: [NO2]+[Al(NO3)4]−. A way to make a tetranitratoaluminate salt of a cation is to treat the chloride of the cation and aluminium chloride with liquid dinitrogen tetroxide pure or dissolved in nitromethane. The reaction is started at liquid nitrogen temperatures and then warmed up. Dark red nitrosyl chloride is formed as a byproduct. The byproducts and solvents can then be evaporated. The tetramethylammonium salt can form this way.

Properties The tetranitratoaluminate group has two bidentate nitrate groups attached in a square around the aluminium, and with two other monodentate nitrates attached via one oxygen only, perpendicular, up and down from the square. Tetranitratoaluminate salts are not completely stable and can decompose to the nitrates and aluminium oxynitrates. When nitronium tetranitratoaluminate is sublimed it can form anhydrous aluminium nitrate. Nitronium tetranitratoaluminate dissolved in a nitric acid and dinitrogen pentoxide mixture yields the hexanitratoaluminate complex. In water is it converted to the hexaaqua complex with six water molecules replacing the nitrate groups.

Examples Tetraethyl ammonium tetranitratoaluminate along with nitronium tetranitratoaluminate were the first to be discovered. 1-Ethyl-4,5-dimethyl-tetrazolium tetranitratoaluminate is an oxygen balanced ionic liquid, This liquid salt is stable when moisture is excluded. It is soluble in methyl nitrate. It solidifies to a glass at −46 °C, starts to slowly decompose at 75 °C, and inflames, without oxygen required, around 200 °C. When it burns it produces aluminium oxide, nitrogen, water and carbon monoxide. It is being proposed as a rocket propellant, because it has better performance than hydrazine. Rubidium and caesium also form salts. Tetramethyl ammonium tetranitratoaluminate forms monoclinic crystals with a = 12.195 Å, b = 9.639 Å, c = 12.908 Å, α = 90°, β = 110.41°, γ = 90°, and a formula weight of 349.17 (4 equivalents) per unit cell. The unit cell volume is 1422 Å3 and the calculated density 1.631 g/cm3.

References

Illustrations

Worked examples

Example 1 — a first encounter with Tetranitratoaluminate

Start with the simplest possible case. Write down what Tetranitratoaluminate claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Tetranitratoaluminate 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 Tetranitratoaluminate 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 Tetranitratoaluminate

In research: Tetranitratoaluminate appears in science 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 Tetranitratoaluminate 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: Tetranitratoaluminate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aluminium complexes, Anions, Nitrates, so understanding it makes those chapters shorter.
In everyday life: Look for Tetranitratoaluminate 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 Tetranitratoaluminate in 20 minutes

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

Frequently asked questions

What is Tetranitratoaluminate in simple terms?

Why does Tetranitratoaluminate matter?

Because it connects several science 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 Tetranitratoaluminate?

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 Tetranitratoaluminate.