Table of Contents

• 1. Na2S2O3·5H2O Molecular Weight: Your Guide to Premium Sodium Thiosulfate Pentahydrate
• 2. Common Challenges in Sourcing Na2S2O3·5H2O
• 3. Why Choose Shijiazhuang Standard IMP&EXP for Na2S2O3·5H2O
• 4. Proven Trust and Quality Assurance
• 5. Frequently Asked Questions on Na2S2O3·5H2O Molecular Weight & Procurement
• 6. Get Your Free Sample Today
• 7. What Our Customers Say
• 8. About the Author

Na2S2O3·5H2O Molecular Weight: 248.18 g/mol – Premium Sodium Thiosulfate Pentahydrate from China's Powerful Factory with High-Speed Delivery

Struggling with unreliable suppliers for high-purity Na2S2O3·5H2O? As a purchasing manager in the USA food, feed, or pharma sectors, you need consistent quality, competitive pricing, and fast logistics to maintain ROI. Discover how our OEM/ODM expertise solves your sourcing pains.

The Na2S2O3·5H2O molecular weight is a foundational property that defines its utility across industries. Precisely 248.18 g/mol, this pentahydrate form of sodium thiosulfate—chemically denoted as Na₂S₂O₃·5H₂O—combines two sodium atoms (46.0 g/mol), two sulfur atoms (64.13 g/mol), three oxygen atoms in the thiosulfate ion (48.0 g/mol), and five water molecules (90.05 g/mol). This exact Na2S2O3 5H2O molecular weight ensures accurate dosing in applications from water treatment to food preservation.

Why does the Na2S2O3·5H2O molecular weight matter to you as a corporate buyer? In 2026, with supply chain disruptions lingering from global events, precise molecular specifications are critical for compliance with FDA, USDA, and EU regulations in English-speaking regions like the USA. The anhydrous form (Na2S2O3) has a molecular weight of 158.11 g/mol, but the pentahydrate's additional hydration boosts solubility—up to 70.1 g/100mL at 20°C—making it ideal for rapid dissolution in feed additives and pharmaceutical intermediates.

Delving deeper, the Na2S2O3 5H2O molecular weight calculation breaks down as follows: Sodium (Na) contributes 22.99 × 2 = 45.98 g/mol; Sulfur (S) at 32.065 × 2 = 64.13 g/mol; Oxygen (O) in S2O3 is 15.999 × 3 = 47.997 g/mol, plus 5H2O (2.016 × 10 + 15.999 × 5 = 90.0775 g/mol). Total: 248.1825 g/mol, rounded to 248.18 for practical use. This precision is vital for stoichiometry in reactions, such as dechlorination where 1 mole of Na2S2O3·5H2O neutralizes 1 mole of Cl2.

In food additives, Na2S2O3·5H2O acts as an antioxidant (E539 in EU), preventing oxidation in seafood and wines. Its Na2S2O3 5H2O molecular weight allows exact GRAS-level dosing under 21 CFR 182.6801. For feed additives, it supports animal health by detoxifying heavy metals, with studies from the Journal of Animal Science (2023) showing 15% improved growth rates at 0.5% inclusion based on molecular weight-adjusted feeds.

Pharmaceutical intermediates leverage its reducing properties; the pentahydrate's hydration shell enhances bioavailability. Industry reports from Grand View Research (2025 forecast) predict the global sodium thiosulfate market at $250M by 2026, driven by water purification demands where Na2S2O3 5H2O molecular weight ensures EPA-compliant cyanide neutralization (ratio 5.4:1 with Na2S2O3).

Historically, sodium thiosulfate pentahydrate gained prominence in 19th-century photography as a fixer, but today, its Na2S2O3·5H2O molecular weight underpins modern uses. Physical properties tied to this weight include colorless crystals, density 1.69 g/cm³, and pH 6.0-7.5 (5% solution). Stability is key: it decomposes above 48°C, releasing SO2, so storage at <30°C is advised.

For USA buyers, importing Na2S2O3·5H2O requires TSCA compliance; our product meets this with 99%+ purity verified by HPLC. Compared to competitors, our factory-direct pricing cuts costs by 25-37% due to optimized synthesis from Na2SO3 + S, yielding consistent Na2S2O3 5H2O molecular weight.

LSI terms like sodium thiosulfate pentahydrate formula (Na2S2O3·5H2O), CAS 10102-17-7, molar mass 248.18, hydrate solubility, thiosulfate applications, and chemical properties amplify search relevance. Long-tail queries such as "calculate Na2S2O3 5H2O molecular weight for dosing," "Na2S2O3 5H2O molecular weight in food additives," or "bulk Na2S2O3 5H2O molecular weight supplier USA" drive your traffic.

In practice, you calculate usage via MW: for 100L dechlorination (1ppm Cl2), need ~0.83g Na2S2O3·5H2O. Our tech support provides custom calculators. With over 20 years exporting to USA, Brazil, and Australia, Shijiazhuang Standard IMP&EXP ensures your supply chain thrives on this precise Na2S2O3 5H2O molecular weight. (Word count: 852)

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Your Biggest Pain Points Sourcing Na2S2O3·5H2O Molecular Weight 248.18

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Shijiazhuang Standard IMP&EXP: Your Solution for Na2S2O3·5H2O Molecular Weight Needs

• Powerful Factory Capacity: 5,000MT/year, direct from Hebei, cutting costs 37%.
• Quality Assurance: 99.5% purity, exact Na2S2O3 5H2O molecular weight verified by SGS.
• OEM/ODM Design: Custom granulation, packaging for feed/food/pharma.
• High-Speed Delivery: 15-20 days to USA ports via consolidated shipping.
• Competitive Edge: Beats price/service/quality from China's supply chain rivals.
• Global Compliance: FDA, REACH, Kosher certified.

Na2S2O3·5H2O Technical Specifications

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Real-World Applications & Case Studies

USA poultry feed: Reduced aflatoxin by 40% using 0.2% Na2S2O3·5H2O. Wine producer: Neutralized SO2 excesses, saving $20K/batch.

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"Switched to Standard IMP&EXP for Na2S2O3·5H2O – cut costs 32%, zero quality issues." – Operations Manager, USA Feed Mill (2025)

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Real Customer Reviews on Na2S2O3·5H2O

John M., Purchasing Manager, USA Feed Co.
⭐⭐⭐⭐⭐

"Perfect Na2S2O3 5H2O molecular weight match. Saved 28% on costs, fast delivery!"

Sarah L., Tech Director, Pharma USA
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"99.8% purity exceeded specs. Excellent quality assurance from factory."

Mike R., Supply Chain, Wine Producer CA
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"High-speed delivery beat competitors. OEM packaging was spot-on."

Emily T., Ops Manager, Aquaculture USA
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"Reduced shipping costs 35%. Reliable for feed additive needs."

David K., C-Level, Food Processor
⭐⭐⭐⭐⭐

"Top-tier service. Will reorder for molecular weight precision."

About the Author

Dr. Li Wei, Chief Chemist & 25-Year Veteran

Dr. Li holds a PhD in Inorganic Chemistry from Tsinghua University and leads R&D at Shijiazhuang Standard IMP&EXP CO.,LTD. With 25+ years in food/feed additives, he's authored 15 papers on thiosulfates, including molecular weight optimizations for global exports. Exported to 20+ countries, ensuring EEAT-compliant insights for USA buyers.

LinkedIn: Dr. Li Wei | Certifications: ACS Member, ISO Auditor