chemistry

Potassium octachlorodimolybdate

Potassium octachlorodimolybdate 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 Potassium octachlorodimolybdate rather than just read about it. In short: Potassium octachlorodimolybdate (systematically named potassium bis(tetrachloromolybdate)(Mo–Mo)(4−)) is an inorganic compound with the chemical formula K4Mo2Cl8. It is known as a red-coloured, microcrystalline solid.

Key takeaways

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

Reference excerpt

Potassium octachlorodimolybdate (systematically named potassium bis(tetrachloromolybdate)(Mo–Mo)(4−)) is an inorganic compound with the chemical formula K4Mo2Cl8. It is known as a red-coloured, microcrystalline solid. The anion is of historic interest as one of the earliest illustrations of a quadruple bonding. The salt is usually obtained as the pink-coloured dihydrate.

The compound is prepared in two steps from molybdenum hexacarbonyl:

2 Mo(CO)6 + 4 CH3CO2H → (CH3CO2)4Mo2 + 2 H2 + 12 CO (CH3CO2)4Mo2 + 4 HCl + 4 KCl → K4Mo2Cl8 + 4 CH3CO2H The reaction of the acetate with HCl was first described as providing trimolybdenum compounds, but subsequent crystallographic analysis confirmed that the salt contains the [Cl4Mo≣MoCl4]4− anion, with D4h symmetry, in which the two Mo atoms are linked by a quadruple bond. Each Mo atom is bounded with four Cl− ligands by a single bond. Each MoCl4 group is a regular square pyramid, with an Mo atom at the apex, and four Cl atoms at the vertices of the square base of the pyramid. The Mo–Mo distance is 214 pm.

References

Illustrations

Worked examples

Example 1 — a first encounter with Potassium octachlorodimolybdate

Start with the simplest possible case. Write down what Potassium octachlorodimolybdate 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 Potassium octachlorodimolybdate 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 Potassium octachlorodimolybdate 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 Potassium octachlorodimolybdate

In research: Potassium octachlorodimolybdate 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 Potassium octachlorodimolybdate 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: Potassium octachlorodimolybdate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chemical compounds containing metal–metal bonds, Chloro complexes, Molybdenum compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Potassium octachlorodimolybdate 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 Potassium octachlorodimolybdate in 20 minutes

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

Frequently asked questions

What is Potassium octachlorodimolybdate in simple terms?

Why does Potassium octachlorodimolybdate 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 Potassium octachlorodimolybdate?

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 Potassium octachlorodimolybdate.