{"product_id":"phosphoric-acid-5-w-w-55gal-drum-pa0005-55","title":"Phosphoric Acid 5% (w\/w), 55 Gallon Drum","description":"\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat it is.\u003c\/strong\u003e This phosphoric acid is a 5% (w\/w) aqueous solution supplied in a 55 gallon drum. It is a clear, colorless, dilute acid for production-scale cleaning, rust removal, metal pretreatment, and pH adjustment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat 5% (w\/w) means.\u003c\/strong\u003e Every 100 g of solution contains 5 g of phosphoric acid. That equals roughly 0.5 M (calculated), a mild working strength that is effective for many cleaning and pH control tasks while far less hazardous to handle than 85% concentrate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical identity.\u003c\/strong\u003e Phosphoric acid (orthophosphoric acid, CAS 7664-38-2, H3PO4, 98.00 g\/mol) is a triprotic mineral acid with pKa values of about 2.15, 7.20, and 12.32. It is weaker than hydrochloric or sulfuric acid but reacts readily with metal oxides and carbonates.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRust removal and conversion.\u003c\/strong\u003e Phosphoric acid reacts with iron oxide to form iron phosphate, which dissolves rust and leaves a thin phosphate layer on steel. That layer improves paint adhesion and slows flash rusting, which is why phosphoric acid is a common metal pretreatment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCleaning and descaling.\u003c\/strong\u003e Dilute phosphoric acid removes mineral scale, milkstone, and hard-water deposits from equipment and surfaces. It is widely used in food, dairy, and beverage plants for acid cleaning cycles, alongside alkaline washes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH adjustment.\u003c\/strong\u003e Because it is a moderate, non-oxidizing acid, phosphoric acid is used to lower pH in water treatment, process streams, and formulations, and its phosphate salts provide buffering in the neutral range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFood and beverage use.\u003c\/strong\u003e Phosphoric acid is also a common food acidulant, best known for giving cola beverages their tartness, and dilute solutions are used for acid rinses in food processing. Confirm grade suitability before any food-contact use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrum size for production.\u003c\/strong\u003e The 55 gallon drum supplies production lines, cleaning-in-place systems, and treatment operations that use dilute acid continuously, providing one consistent lot and reducing handling of concentrated acid. Use drum pumps rated for acids for dispensing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHandling at a glance.\u003c\/strong\u003e Five-percent phosphoric acid can irritate skin and eyes. Wear safety glasses or goggles and acid-resistant gloves, and rinse splashes with water. For concentrated acid, see Lab Pro's \u003ca href=\"https:\/\/labproinc.com\/products\/phosphoric-acid-85-acs-grade-100-ml-1-pint\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ePhosphoric Acid 85%, ACS Grade (100 mL, 1 Pint)\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse; border:1px solid #cfcfcf; margin-bottom:28px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eChemical Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003ePhosphoric acid, aqueous solution\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eCAS Numbers\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e7664-38-2 (phosphoric acid); 7732-18-5 (water)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eEC Number (H3PO4)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e231-633-2\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eSynonyms\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eOrthophosphoric acid, dilute phosphoric acid\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eFormula (active)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eH3PO4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eMolecular Weight (active)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e98.00 g\/mol\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eConcentration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e5% (w\/w)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eApproximate Molarity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eAbout 0.5 M (calculated)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003epKa Values\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eAbout 2.15, 7.20, 12.32\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eAppearance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eClear, colorless liquid\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003ePhysical State\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eLiquid, aqueous solution\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eHazard Profile\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eSkin and eye irritant at this strength (confirm on SDS)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eDOT\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eExposure Limits (phosphoric acid mist)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eOSHA PEL 1 mg\/m³ TWA; NIOSH REL 1 mg\/m³ TWA, 3 mg\/m³ STEL\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003ePackage Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e55 gallon drum\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eApplications \/ Common Uses\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRust removal:\u003c\/strong\u003e Converts and removes iron oxide from steel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal pretreatment:\u003c\/strong\u003e Leaves a phosphate layer that improves paint adhesion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAcid cleaning:\u003c\/strong\u003e Removes scale and milkstone in food and dairy plants.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH adjustment:\u003c\/strong\u003e Lowers pH in water treatment and process streams.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDescaling:\u003c\/strong\u003e Dissolves hard-water deposits from equipment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStorage, Handling \u0026amp; Shipping\u003c\/h4\u003e\n\u003cp\u003eStore the drum tightly closed in a cool, well-ventilated area on secondary containment, away from bases, reactive metals, and oxidizers. Use acid-rated drum pumps for dispensing and keep the area clean and clearly labeled.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncompatible materials:\u003c\/strong\u003e Strong bases, reactive metals (which release hydrogen), and strong oxidizers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExposure limits (phosphoric acid mist):\u003c\/strong\u003e OSHA PEL 1 mg\/m³ TWA; NIOSH REL 1 mg\/m³ TWA, 3 mg\/m³ STEL.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpill response:\u003c\/strong\u003e Contain, neutralize with sodium bicarbonate or lime, and rinse with water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirst aid:\u003c\/strong\u003e Eyes or skin: rinse with water for several minutes and seek medical advice if irritation persists.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGHS signal word:\u003c\/strong\u003e  .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDOT \/ shipping:\u003c\/strong\u003e  .\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eRelated Categories \u0026amp; Services\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eShop \u003ca href=\"https:\/\/labproinc.com\/collections\/acids\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eAcids\u003c\/a\u003e for related products in this category.\u003c\/li\u003e\n\u003cli\u003eExplore \u003ca href=\"https:\/\/labproinc.com\/collections\/inorganic-chemicals\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eInorganic Chemicals\u003c\/a\u003e and \u003ca href=\"https:\/\/labproinc.com\/pages\/buffers-standards-solutions\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eBuffers, Standards \u0026amp; Solutions\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/labproinc.com\/pages\/be-a-lab-pro-vmi-program\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eVendor Managed Inventory (VMI) Program\u003c\/a\u003e: Lab Pro can stock, track, and replenish this item on site so it never runs out. Contact info@labproinc.com or 888-452-2776 to set up a VMI assessment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eRelated Articles\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/labproinc.com\/blogs\/chemicals-and-solvents\/top-5-uses-of-phosphoric-acid\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eTop 5 Uses of Phosphoric Acid\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/labproinc.com\/blogs\/chemicals-and-solvents\/what-is-phosphoric-acid-and-its-uses\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eWhat is Phosphoric Acid and Its Uses\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/labproinc.com\/blogs\/news\/chemical-dilution-calculator\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eChemical Dilution Calculator: Acid \u0026amp; Solvent Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lab Pro Inc","offers":[{"title":"Default Title","offer_id":47266337554581,"sku":"PA0005-55","price":692.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/2327\/6437\/files\/MainImage_5fd62626-4162-4171-9c55-1030886a2fd9.png?v=1791890805","url":"https:\/\/checkout.labproinc.com\/products\/phosphoric-acid-5-w-w-55gal-drum-pa0005-55","provider":"Lab Pro Inc Plus","version":"1.0","type":"link"}