chemistry

Sodium dithiophosphate

Sodium dithiophosphate 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 Sodium dithiophosphate rather than just read about it. In short: Sodium dithiophosphate is the salt with the formula Na3PS2O2. It is usually supplied as the hydrated solid or as an aqueous solution together with other thiophosphates such as sodium monothiophosphate and sodium trithiophosphate.

Key takeaways

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

Reference excerpt

Sodium dithiophosphate is the salt with the formula Na3PS2O2. It is usually supplied as the hydrated solid or as an aqueous solution together with other thiophosphates such as sodium monothiophosphate and sodium trithiophosphate. Both Na3PS2O2 and its hydrate are colorless solids, but commercial samples can appear dark owing to the presence of impurities. It is used to facilitate the isolation of molybdenum from its ores.

Preparation The compound has been prepared in a multistep process starting with the base hydrolysis of phosphorus pentasulfide:

P2S5 + 6 NaOH → 2 Na3PO2S2 + H2S + 2 H2O The salt is isolated as the hydrate Na3PO2S2.(H2O)11. It is prone to hydrolysis, especially when it is heated as an aqueous solutions:

Na3PO2S2 + 2 H2O → Na3PO3S + H2S The structure of the anhydrous compound has been examined by X-ray crystallography. The material consists of tetrahedral PO2S23- centers interconnected by Na+ ions. It is assumed that the hydrate retains the tetrahedral PO2S23- centers, but that the Na+ ions are bonded to water.

Applications The hydrated salt is used as a flotation agent in the purification of molybdenite (MoS2) from other components of the ores. It is a major component of "Nokes reagent" (after Charles M. Nokes, who patented it in 1948). The salt is generated by the reaction of phosphorus pentasulfide with sodium hydroxide, often using impure reagents to obtain a mixture of the desired salt and related thiophosphates and oxidized species. Molybdenite particles, which are normally hydrophobic, become hydrophilic in the presence of this salt.

Related dithiophosphates Organic esters of dithiophosphate are sometimes also called dithiophosphates. Diethyl dithiophosphoric acid is the parent of one series of these organic compounds. These compounds are salts with the formula M+(RO)2PS−2 (R = alkyl, usually). These lipophilic salts have also been used as a flotation "collectors" in the purification of various sulfide minerals. Zinc dithiophosphates also refers to this class of organic compounds.

References

Illustrations

Worked examples

Example 1 — a first encounter with Sodium dithiophosphate

Start with the simplest possible case. Write down what Sodium dithiophosphate 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 Sodium dithiophosphate 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 Sodium dithiophosphate 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 Sodium dithiophosphate

In research: Sodium dithiophosphate 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 Sodium dithiophosphate 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: Sodium dithiophosphate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Inorganic compound stubs, Metallurgical processes, Phosphorodithioates, so understanding it makes those chapters shorter.
In everyday life: Look for Sodium dithiophosphate 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 Sodium dithiophosphate in 20 minutes

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

Frequently asked questions

What is Sodium dithiophosphate in simple terms?

Why does Sodium dithiophosphate 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 Sodium dithiophosphate?

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 Sodium dithiophosphate.