chemistry

Hydrazinium chloride

Hydrazinium chloride 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 Hydrazinium chloride rather than just read about it. In short: Hydrazinium chloride is an inorganic compound with the chemical formula [NH2NH3]Cl or [N2H5]Cl. It is a colorless hygroscopic crystalline solid.

Key takeaways

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

Reference excerpt

Hydrazinium chloride is an inorganic compound with the chemical formula [NH2NH3]Cl or [N2H5]Cl. It is a colorless hygroscopic crystalline solid. It is the hydrazine salt of hydrogen chloride. It consists of hydrazinium cations [H2N−NH3]+ and chloride anions Cl−. It decomposes at 240 °C (464 °F), producing hydrogen chloride and nitrogen oxides.

Synthesis Hydrazinium chloride can be synthesized by the reaction of hydrazine and hydrogen chloride.

H2N−NH2 + HCl → [H2N−NH3]+Cl−

Structure Hydrazinium chloride has an orthorhombic crystal structure (a = 1249 pm, b = 2185 pm, c = 441 pm) with the space group Fdd2. The crystal of hydrazinium chloride obtained from an alcoholic solution are very fine needles parallel to the c axis. Hydrazinium chloride passes through several phase transitions at elevated pressures. The structure of phase I at room temperature and 1.8 GPa is confirmed to be space group C2/c. A structural transition from phase I to phase II is observed at 7.3 GPa. Pressure-induced position variation of hydrogen atoms in −NH+3 units during the phase transition is attributed to the formation of N―H···Cl hydrogen bonds. Finally, a further transition from phase II to phase III accompanied with a slight distortion in the hydrazinium ions occurs above 19.8 GPa. Phase III exists up to at least 39.5 GPa.

Uses Hydrazinium chloride is commonly used as a reagent in the synthesis of pyrazoles. It is used as a catalyst in the synthesis of titanium oxide polymers via catalytic sol-gel process, and in preparation of amorphous titanium dioxide thin films with high refractive indices and high transparency. Hydrazinium chloride is often used as a reducing agent in various chemical reactions and has uses in the preparation of other hydrazine derivatives. It is also used in the preparation of certain pharmaceuticals and as a reagent in analytical chemistry. Hydrazinium chloride can be used to synthesize energetic materials containing hydrazinium cation.

References

Illustrations

Worked examples

Example 1 — a first encounter with Hydrazinium chloride

Start with the simplest possible case. Write down what Hydrazinium chloride 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 Hydrazinium chloride 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 Hydrazinium chloride 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 Hydrazinium chloride

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

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

Frequently asked questions

What is Hydrazinium chloride in simple terms?

Hydrazinium chloride is an inorganic compound with the chemical formula [NH2NH3]Cl or [N2H5]Cl. It is a colorless hygroscopic crystalline solid.

Why does Hydrazinium chloride 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 Hydrazinium chloride?

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 Hydrazinium chloride.