chemistry

Violuric acid

Violuric acid 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 Violuric acid rather than just read about it. In short: Violuric acid is an organic compound with the formula HON=C(CONH)2CO. It crystallizes as white or off-white monohydrate.

Key takeaways

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

Reference excerpt

Violuric acid is an organic compound with the formula HON=C(CONH)2CO. It crystallizes as white or off-white monohydrate. The compound has attracted attention because its salts are deeply colored.

Reactions It readily deprotonated to give salts of the anion [ON=C(CONH)2CO]−, which are often deeply colored.

Preparation It was prepared by Adolf Baeyer by reaction of barbituric acid with nitrous acid. It can also be produced by condensation of alloxan with hydroxylamine. as typical for forming the oxime of other carbonyl compounds.

Analytical reagents

Violuric acid and many of its derivatives, such as thiovioluric acid, 1,3-dimethylvioluric acid, and diphenylthiovioluric acid, have historically been used as analytical reagents for spectrophotometric determination and titration of various metals and metal-ions. It was also used as a novel staining/spraying agent for inorganic paper chromatography to identify and separate metals based on color. Most derivatives of violuric acid will also typically form brightly colored salts with most metals and nitrogen bases. Because of the characteristic and diverse colors that violuric acid forms with alkali metals, it has been used photometrically to determine the amount of sodium in blood serum.

References

Illustrations

Worked examples

Example 1 — a first encounter with Violuric acid

Start with the simplest possible case. Write down what Violuric acid 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 Violuric acid 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 Violuric acid 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 Violuric acid

In research: Violuric acid 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 Violuric acid 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: Violuric acid is common in secondary-school and first-year university syllabi. It links to neighbouring topics Barbiturates, Methylglyoxalmonoxim derivatives, Nitroso compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Violuric acid 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 Violuric acid in 20 minutes

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

Frequently asked questions

What is Violuric acid in simple terms?

Violuric acid is an organic compound with the formula HON=C(CONH)2CO. It crystallizes as white or off-white monohydrate.

Why does Violuric acid 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 Violuric acid?

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 Violuric acid.