Alliance Chemical Resource Library

Water & EnvironmentalAug 14, 202615 min read

Who Discovered Chlorine? The 1774 Green Gas That Became Sodium Hypochlorite

Sodium hypochlorite is the sodium salt of hypochlorous acid, with the chemical formula NaOCl and CAS number 7681-52-9. It was first produced in 1820 by Antoine...

Chemical & Product GuidesAug 6, 20265 min read

What Bleach Actually Is: Sodium Hypochlorite From 1% to 12.5%

Bleach is a water solution of sodium hypochlorite (NaOCl), typically at 5–6% concentration for household use, with the remainder being water and a small amount of...

Water & EnvironmentalJun 18, 202616 min read

Sodium Hypochlorite for Cooling Towers & AI Data Centers: Dosing, Cost & Treatment Guide

Sodium hypochlorite (NaOCl, CAS 7681-52-9) — liquid chlorine bleach — is the workhorse oxidizing biocide for recirculating cooling-tower water. Dosed to an ORP/free-chlorine setpoint (commonly ~0.5 ppm...

Water & EnvironmentalAug 26, 202515 min read

An Engineer's Guide to Sodium Bisulfite for Dechlorination

Residual chlorine from pre-oxidation is a silent killer of expensive ion exchange resins, causing premature failure and crippling treatment efficiency. For engineers and operators of arsenic...

Safety & HandlingFeb 1, 202415 min read

Sodium Hypochlorite 12.5%: How It Works on Mould and Algae Staining

Sodium hypochlorite 12.5% is an industrial-strength aqueous solution of the chemical with CAS Number 7681-52-9 and a molecular weight of 74.44, appearing as a pale yellow...

Industrial ApplicationsJul 30, 20237 min read

The Top Applications of Sodium Hypochlorite 12.5% in Everyday Industries

Sodium hypochlorite 12.5% is a pale yellow liquid chemical (formula NaOCl, CAS 7681-52-9, molecular weight 74.44 g/mol) used in industrial and commercial applications such as municipal...

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