Hydrazine sulfate
[CAS 10034-93-2]

Identification

• Classification: Inorganic chemical industry >> Inorganic salt >> Hydrazine and hydroxylamine and their inorganic salts
• Name: Hydrazine sulfate
• Synonyms: Hydrazinium sulfate
• Molecular Formula: H₄N₂.H₂SO₄
• Molecular Weight: 130.12
• CAS Registry Number: 10034-93-2
• EC Number: 233-110-4
• SMILES: NN.OS(=O)(=O)O

Properties

• Density: 1.37 g/mL (Expl.)
• Melting point: 254 °C (Expl.)
• Solubility: water 30 g/L (20 °C) (Expl.)

Safety Data

• Hazard Symbols: GHS05;GHS06;GHS07;GHS08;GHS09 Danger
• Risk Statements: H301+H311+H331-H301-H311-H314-H317-H318-H331-H350-H400-H410
• Safety Statements: P203-P260-P261-P262-P264-P264+P265-P270-P271-P272-P273-P280-P301+P316-P301+P330+P331-P302+P352-P302+P361+P354-P304+P340-P305+P354+P338-P316-P317-P318-P321-P330-P333+P317-P361+P364-P362+P364-P363-P391-P403+P233-P405-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Acute toxicity	Acute Tox.	3	H301
Acute toxicity	Acute Tox.	3	H311
Skin sensitization	Skin Sens.	1	H317
Chronic hazardous to the aquatic environment	Aquatic Chronic	1	H410
Acute hazardous to the aquatic environment	Aquatic Acute	1	H400
Carcinogenicity	Carc.	1B	H350
Acute toxicity	Acute Tox.	3	H331
Serious eye damage	Eye Dam.	1	H318
Skin corrosion	Skin Corr.	1B	H314
Skin corrosion	Skin Corr.	1A	H314
Acute toxicity	Acute Tox.	2	H330
Carcinogenicity	Carc.	1A	H350
Skin corrosion	Skin Corr.	1C	H314

• Transport Information: UN 2923

chemBlink Chemical Story

Hydrazine sulfate, CAS 10034-93-2, is the crystalline sulfate salt of hydrazine. Its chemical story is best understood by looking at how its structure creates function rather than by treating the name as a simple catalog label. The molecule or material combines an N-N hydrazine framework in an ionic sulfate salt, a combination that explains its relevance to synthetic and redox reagent chemistry.

Hydrazine can act as a reducing agent, nucleophile and precursor to nitrogen-containing heterocycles. Salt formation changes physical form and acid-base state without eliminating that underlying reactivity. The American Chemical Society maintains a reagent-grade monograph specifying assay and impurity tests, reflecting its established laboratory use.

Hydrazine sulfate was also promoted historically as an alternative cancer treatment, but controlled clinical evidence did not establish it as an effective cancer therapy. Hydrazine compounds remain hazardous, so a crystalline appearance should not be mistaken for low chemical risk.

A broader lesson follows from this example. Chemical identity is only the starting point for performance. In polymers and surfactants, composition, molecular distribution and formulation can dominate behavior; in synthetic intermediates, the value may lie in transformations that occur only in later steps; in biologically active compounds, mechanism must be separated from clinical evidence. For Hydrazine sulfate, the most reliable interpretation is therefore the one supported by its documented chemistry and literature rather than an assumed application.

The compound also illustrates why specialty chemicals often look more complicated than their job description suggests. Functional groups are selected to solve different parts of a practical problem: one region may provide reactivity, another solubility or interfacial affinity, and another stability or a controllable breaking point. Once those roles are separated, the long chemical name becomes a map of molecular design.

References:
ACS Reagent Chemicals, Hydrazine Sulfate, DOI: 10.1021/acsreagents.4159.20190201; PubChem, Hydrazine sulfate, CAS 10034-93-2; U.S. National Cancer Institute, Hydrazine Sulfate clinical evidence review.

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