chemistry

Gold(III) sulfide

Gold(III) sulfide 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 Gold(III) sulfide rather than just read about it. In short: Gold(III) sulfide or auric sulfide is an inorganic compound with the formula Au2S3. Auric sulfide has been described as a black and amorphous solid.

Key takeaways

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

Reference excerpt

Gold(III) sulfide or auric sulfide is an inorganic compound with the formula Au2S3. Auric sulfide has been described as a black and amorphous solid. Only the amorphous phase has been produced, and the only evidence of existence is based on thermal analysis.

Claims Early investigations claimed to prepare auric sulfide by the reaction of lithium tetrachloroaurate with hydrogen sulfide:

2 Li[AuCl4] + 3 H2S → Au2S3 + 2 LiCl + 6 HCl Similar preparations via chloroauric acid, auric chloride, or gold(III) sulfate a claimed proceed in anhydrous solvents, but water evinces a redox decomposition into metallic gold in sulfuric acid:

8 Au3+ + 3 S2− + 12 H2O → 8 Au + 3 H2SO4 + 18 H+ Conversely, it is claimed that cyclo-octasulfur reduces gold(III) sulfate to a mixture of gold sulfides and sulfur oxides:

Au2(SO4)3 + S8 → Au2S3 + Au2S + 4 SO3 + 6 SO2 Auric sulfide has also been claimed as the product when auric acetate is sonicated with cyclo-octasulfur in decalin. Auric sulfide is claimed to react with nitric acid as well sodium cyanide. It is claimed to dissolve in concentrated sodium sulfide solution.

Worked examples

Example 1 — a first encounter with Gold(III) sulfide

Start with the simplest possible case. Write down what Gold(III) sulfide 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 Gold(III) sulfide 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 Gold(III) sulfide 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 Gold(III) sulfide

In research: Gold(III) sulfide 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 Gold(III) sulfide 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: Gold(III) sulfide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Gold(III) compounds, Hypothetical chemical compounds, Sesquisulfides, so understanding it makes those chapters shorter.
In everyday life: Look for Gold(III) sulfide 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 Gold(III) sulfide in 20 minutes

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

Frequently asked questions

What is Gold(III) sulfide in simple terms?

Gold(III) sulfide or auric sulfide is an inorganic compound with the formula Au2S3. Auric sulfide has been described as a black and amorphous solid.

Why does Gold(III) sulfide 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 Gold(III) sulfide?

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 Gold(III) sulfide.