chemistry

Methyl nitrate

Methyl nitrate 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 Methyl nitrate rather than just read about it. In short: Methyl nitrate is the methyl ester of nitric acid and has the chemical formula CH3NO3. It is a colourless explosive volatile liquid.

Key takeaways

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

Reference excerpt

Methyl nitrate is the methyl ester of nitric acid and has the chemical formula CH3NO3. It is a colourless explosive volatile liquid.

Synthesis It can be produced by the condensation of nitric acid and methanol:

CH3OH + HNO3 → CH3NO3 + H2O A newer method uses methyl iodide and silver nitrate:

CH3I + AgNO3 → CH3NO3 + AgI Methyl nitrate can be produced on a laboratory or industrial scale either through the distillation of a mixture of methanol and nitric acid, or by the nitration of methanol by a mixture of sulfuric and nitric acids. The first procedure is not preferred due to the great explosion danger presented by the methyl nitrate vapour. The second procedure is essentially identical to that of making nitroglycerin. However, the process is usually run at a slightly higher temperature and the mixture is stirred mechanically on an industrial scale instead of with compressed air. Electrolytic production methods have been reported involving electrolyzing sodium acetate and sodium nitrate in acetic acid. Methyl nitrate is also the product of the oxidation of some organic compounds in the presence of nitrogen oxides and chlorine, namely chloroethane or di-tert-butyl ether, while also producing nitromethane. Oxidation of nitromethane using nitrogen dioxide in an inert atmosphere can also yield methyl nitrate.

Explosive properties Methyl nitrate is a sensitive explosive. When ignited it burns extremely fiercely with a gray-blue flame. Methyl nitrate is a very strong explosive with a detonation velocity of 6,300 m/s, like nitroglycerin, ethylene glycol dinitrate, and other nitrate esters. The sensitivity of methyl nitrate to initiation by detonation is among the greatest known, with even a number one blasting cap, the lowest power available, producing a near full detonation of the explosive. Despite the superior explosive properties of methyl nitrate, it has not received application as an explosive due mostly to its high volatility, which prevents it from being stored or handled safely.

Safety As well as being an explosive, methyl nitrate is toxic and causes headaches when inhaled.

History Methyl nitrate has not received much attention as an explosive, but as a mixture containing 25% methanol it was used as rocket fuel and volumetric explosive under the name Myrol in Nazi Germany during World War II. This mixture would evaporate at a constant rate and so its composition would not change over time. It presents a slight explosive danger (it is somewhat difficult to detonate) and does not detonate easily via shock. According to A. Stettbacher, the substance was used as a combustible during the Reichstag fire in 1933. Gartz shows in a recent work that only methyl nitrate with its production and explosion potential can represent the famous and mysterious Schießwasser ("shooting water") from the German Feuerwerkbuch ("fireworks book") of about 1420 (the oldest technical text in German language). The Feuerwerkbuch describes it as follows (written in Early New High German):

Structure The structure of methyl nitrate has been studied experimentally in the gas phase (combined gas-electron diffraction and microwave spectroscopy, GED/MW) and in the crystalline state (X-ray diffraction, XRD) (see Table 1).

In the solid state there are weak interactions between the O and N atoms of different molecules (see figure).

Illustrations

Worked examples

Example 1 — a first encounter with Methyl nitrate

Start with the simplest possible case. Write down what Methyl nitrate 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 Methyl nitrate 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 Methyl nitrate 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 Methyl nitrate

In research: Methyl nitrate 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 Methyl nitrate 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: Methyl nitrate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alkyl nitrates, Explosive chemicals, Liquid explosives, so understanding it makes those chapters shorter.
In everyday life: Look for Methyl nitrate 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 Methyl nitrate in 20 minutes

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

Frequently asked questions

What is Methyl nitrate in simple terms?

Methyl nitrate is the methyl ester of nitric acid and has the chemical formula CH3NO3. It is a colourless explosive volatile liquid.

Why does Methyl nitrate 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 Methyl nitrate?

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 Methyl nitrate.