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Hydrogen thioperoxide

Hydrogen thioperoxide 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 Hydrogen thioperoxide rather than just read about it. In short: Hydrogen thioperoxide, also called oxadisulfane or sulfanol, is the chemical with the structure H–S–O–H. It can be considered as the simple sulfur-substituted analog of the common hydrogen peroxide (H–O–O–H) chemical, and as the simplest hydrogen chalcogenide containing more than one type of chalcogen.

Hydrogen thioperoxide — main illustration
Hydrogen thioperoxide — illustration

Key takeaways

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

Reference excerpt

Hydrogen thioperoxide, also called oxadisulfane or sulfanol, is the chemical with the structure H–S–O–H. It can be considered as the simple sulfur-substituted analog of the common hydrogen peroxide (H–O–O–H) chemical, and as the simplest hydrogen chalcogenide containing more than one type of chalcogen. The chemical has been described as the "missing link" between hydrogen peroxide and hydrogen disulfide (H–S–S–H), though it is substantially less stable than either of the other two. It is the inorganic parent structure of the sulfenic acid class of organic compounds (R–S–O–H) and also the oxadisulfide linkage (R1–S–O–R2), where "R" is any organic structure. Sulfur is present in oxidation state 0.

Formation Hydrogen thioperoxide has been synthesized in labs by photolysis of a mixture of ozone and hydrogen sulfide frozen in argon at 8 K and by pyrolysis of di-tert-butyl sulfoxide. Yet another synthesis is by an electric discharge through water and sulfur. In the interstellar medium there is a hypothesis that hydrogen thioperoxide is formed in a reaction of sulfur monoxide with the trihydrogen cation, dihydrogen and an electron. Another possible route is sulfur monoxide reacting with atomic hydrogen to form HOS and HSO which in turn can add another hydrogen atom. However this mechanism probably needs a dust grain to take away excess energy.

Properties Hydrogen thioperoxide molecules have a gauche conformation. They are asymmetrical, but have a low barrier to convert from left-hand to right-hand forms, so that the molecule can tunnel between the forms. The measurements of the bond-lengths in hydrogen thioperoxide are H–S 1.3420 Å, S–O 1.6616 Å, O–H 0.9606 Å. The bond angles are H–S–O 98.57°, S–O–H 107.19°. The H–S and O–H bonds are twisted at 90.41°. The half-life of hydrogen thioperoxide in water is 40 minutes, much longer than the expected half-life of less than seconds for a sulfenic acid. In the gas phase at high temperature and low pressure, it has a lifetime on the order of 5 seconds. Its decomposition products include disulfur monoxide and molecular hydrogen.

Reactions Two molecules of hydrogen thioperoxide can undergo cyclocondensation to form sulfinothioic acid HS(=O)SH and water. Hydrosulfide HS− can react with HSOH to yield disulfane HSSH.

References

Worked examples

Example 1 — a first encounter with Hydrogen thioperoxide

Start with the simplest possible case. Write down what Hydrogen thioperoxide 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 Hydrogen thioperoxide 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 Hydrogen thioperoxide 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 Hydrogen thioperoxide

In research
Hydrogen thioperoxide 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 Hydrogen thioperoxide 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
Hydrogen thioperoxide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Hydrogen compounds, Peroxides, Sulfur compounds, so understanding it makes those chapters shorter.
In everyday life
Look for Hydrogen thioperoxide 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 Hydrogen thioperoxide in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Hydrogen thioperoxide means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Hydrogen thioperoxide out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hydrogen thioperoxide in simple terms?

Hydrogen thioperoxide, also called oxadisulfane or sulfanol, is the chemical with the structure H–S–O–H. It can be considered as the simple sulfur-substituted analog of the common hydrogen peroxide (H–O–O–H) chemical, and as the simplest hydrogen chalcogenide containing more than one type of chalco…

Why does Hydrogen thioperoxide 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 Hydrogen thioperoxide?

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 Hydrogen thioperoxide.

Tags

  • Hydrogen compounds
  • Peroxides
  • Sulfur compounds

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