chemistry

Gold(I) cyanide

Gold(I) cyanide 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(I) cyanide rather than just read about it. In short: Gold(I) cyanide is the inorganic compound with the chemical formula AuCN. It is the binary cyanide of gold(I).

Key takeaways

Gold(I) cyanide 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(I) cyanide to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Gold(I) cyanide from memory before moving on to harder problems.

Reference excerpt

Gold(I) cyanide is the inorganic compound with the chemical formula AuCN. It is the binary cyanide of gold(I). It is an odourless, tasteless yellow solid. Wet gold(I) cyanide is unstable to light and will become greenish. Gold(I) cyanide itself is only of academic interest, but its derivative dicyanoaurate is an intermediate in gold cyanidation, the extraction of gold from its ores.

Preparation Solid gold(I) cyanide precipitates upon reaction of potassium dicyanoaurate with hydrochloric acid:

K[Au(CN)2] + HCl → AuCN + HCN + KCl It can also be produced by the reaction of gold(III) chloride and potassium cyanide.

Reactions The solid dissolves to form water-soluble adducts with a variety of ligands: cyanides, hydroxide, ammonia, thiosulfate and hydrosulfide. Like most gold compounds, it converts to metallic gold upon heating.

Structure Gold(I) cyanide's is a coordination polymer consisting of linear chains of AuCN such that each Au(I) center is bonded to carbon and nitrogen. The structure is hexagonal with the lattice parameters a = 3.40 Å and c = 5.09 Å.

References

Illustrations

Worked examples

Example 1 — a first encounter with Gold(I) cyanide

Start with the simplest possible case. Write down what Gold(I) cyanide 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(I) cyanide 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(I) cyanide 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(I) cyanide

In research: Gold(I) cyanide 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(I) cyanide 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(I) cyanide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Coordination polymers, Cyanides, Gold(I) compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Gold(I) cyanide 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(I) cyanide in 20 minutes

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

Frequently asked questions

What is Gold(I) cyanide in simple terms?

Gold(I) cyanide is the inorganic compound with the chemical formula AuCN. It is the binary cyanide of gold(I).

Why does Gold(I) cyanide 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(I) cyanide?

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(I) cyanide.