{"product_id":"methyl-orange-indicator-pure","title":"Methyl Orange Indicator, Pure | pH Indicator Dye for Acid–Base Titrations","description":"\u003cstyle\u003e\n.wrap{font-family:-apple-system,'DM Sans',sans-serif;color:#1e1c18;max-width:800px;line-height:1.6;padding:1rem 0}\n.intro{font-size:14px;line-height:1.8;color:#4a4640;margin-bottom:24px;padding:18px 22px;background:#f8f4ee;border-left:4px solid #2d5a3d;border-radius:3px}\n.intro strong{color:#1a3a2a}\n.section{margin-bottom:28px}\n.heading{font-size:11px;font-weight:500;text-transform:uppercase;letter-spacing:.12em;color:#2d5a3d;margin-bottom:14px;padding-bottom:7px;border-bottom:2px solid #c9a84c;display:inline-block}\n.au-table{width:100%;border-collapse:collapse;font-size:13px}\n.au-table tr{border-bottom:1px solid #e8e4dc}\n.au-table td{padding:10px 14px;vertical-align:top}\n.au-table td:first-child{width:210px;font-weight:500;color:#4a4640;background:#f5f3ee;font-size:12.5px}\n.au-table td:last-child{color:#1e1c18;font-weight:500}\n.coa-table{width:100%;border-collapse:collapse;font-size:12.5px}\n.coa-table th{background:#1a3a2a;color:#e8c96a;padding:9px 12px;text-align:left;font-weight:500;font-size:11px;text-transform:uppercase;letter-spacing:.06em}\n.coa-table tr{border-bottom:1px solid #e8e4dc}\n.coa-table td{padding:9px 12px;vertical-align:middle;color:#1e1c18}\n.coa-table tr:nth-child(even) td{background:#f8f4ee}\n.pass{color:#2d5a3d;font-weight:500}\n.apps{display:grid;grid-template-columns:1fr 1fr;gap:10px}\n.app{background:#f0f4f1;border:1px solid #c8d8cc;border-left:3px solid #2d5a3d;border-radius:3px;padding:10px 14px;font-size:13px;color:#1a3a2a;font-weight:500}\n.app::before{content:'→ ';color:#c9a84c;font-weight:500}\n.feats{display:flex;flex-direction:column;gap:8px}\n.feat{display:flex;align-items:flex-start;gap:10px;font-size:13px;color:#4a4640;padding:8px 12px;background:#f8f4ee;border-radius:3px}\n.feat::before{content:'✓';color:#2d5a3d;font-weight:500;flex-shrink:0;margin-top:1px}\n.stor{display:flex;flex-direction:column;gap:8px}\n.stor-item{display:flex;align-items:flex-start;gap:10px;font-size:13px;color:#4a4640}\n.stor-item::before{content:'✓';color:#2d5a3d;font-weight:500;flex-shrink:0}\n.notice{background:#f0f4f1;border:1px solid #b8ccbe;border-left:4px solid #2d5a3d;border-radius:3px;padding:16px 20px;font-size:13px;color:#4a4640;line-height:1.65}\n.warn{background:#fffbf0;border:1px solid #e8c96a;border-left:4px solid #c9a84c;border-radius:3px;padding:14px 18px;font-size:13px;color:#5a4a20;line-height:1.65}\n.hazard{background:#fff5f5;border:1px solid #e8b0b0;border-left:4px solid #c0392b;border-radius:3px;padding:14px 18px;font-size:13px;color:#7a2020;line-height:1.65}\n.ph-bar{display:flex;align-items:center;gap:0;margin:14px 0;border-radius:4px;overflow:hidden;font-size:12px;font-weight:500}\n.ph-pink{background:#e8547a;color:#fff;padding:10px 20px;flex:1;text-align:center}\n.ph-arrow{background:#d4a0b0;color:#fff;padding:10px 8px;font-size:16px}\n.ph-orange{background:#e8842a;color:#fff;padding:10px 20px;flex:1;text-align:center}\n.badges{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}\n.badge{display:flex;align-items:center;gap:7px;background:#1a3a2a;color:#e8c96a;font-size:12px;font-weight:500;padding:8px 14px;border-radius:3px;letter-spacing:.04em}\n@media(max-width:600px){.apps{grid-template-columns:1fr}.au-table td:first-child{width:130px}}\n\u003c\/style\u003e\n\n\u003cdiv class=\"wrap\"\u003e\n  \u003cdiv class=\"intro\"\u003e\n    \u003cstrong\u003eAuSaMicS Methyl Orange Indicator, Pure (CAT: ASD-633)\u003c\/strong\u003e is a premium-quality azo dye used as a precise pH indicator in analytical chemistry. This batch achieves an \u003cstrong\u003eexceptionally high dye content of 97.3%\u003c\/strong\u003e by spectrophotometry, well above the standard specification of \u0026gt;95.0%. Known for its distinct, sharp colour transition in acidic environments, Methyl Orange is the standard indicator of choice for acid-base titrations involving strong mineral acids and weak bases.\n  \u003c\/div\u003e\n  \u003cdiv class=\"section\"\u003e\n    \u003cdiv class=\"heading\"\u003epH transition range\u003c\/div\u003e\n    \u003cdiv class=\"ph-bar\"\u003e\n      \u003cdiv class=\"ph-pink\"\u003epH ≤ 3.1 — Pink (acid)\u003c\/div\u003e\n      \u003cdiv class=\"ph-arrow\"\u003e→\u003c\/div\u003e\n      \u003cdiv class=\"ph-orange\"\u003epH ≥ 4.4 — Orange-Yellow (base)\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cp style=\"font-size:12.5px;color:#888;margin:4px 0 0;\"\u003eTransition confirmed by spectrophotometry: λmax 504.2 nm (pH 3.1) and λmax 468.6 nm (pH 4.4)\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"section\"\u003e\n    \u003cdiv class=\"heading\"\u003eProduct specifications\u003c\/div\u003e\n    \u003ctable class=\"au-table\"\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCatalog number\u003c\/td\u003e\n\u003ctd\u003eASD-633\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCAS number\u003c\/td\u003e\n\u003ctd\u003e547-58-0\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eColor index\u003c\/td\u003e\n\u003ctd\u003eC.I. 13025 (Acid Orange 52)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMolecular formula\u003c\/td\u003e\n\u003ctd\u003eC₁₄H₁₄N₃NaO₃S\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMolecular weight\u003c\/td\u003e\n\u003ctd\u003e327.33 g\/mol\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGrade\u003c\/td\u003e\n\u003ctd\u003eLaboratory Reagent \/ Indicator Grade\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eForm\u003c\/td\u003e\n\u003ctd\u003ePowder\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eColour (solid)\u003c\/td\u003e\n\u003ctd\u003eDark orange\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSolubility\u003c\/td\u003e\n\u003ctd\u003eSoluble in water — clear orange solution at 0.1%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eDye content\u003c\/td\u003e\n\u003ctd\u003e97.3% (specification: \u0026gt; 95.0%)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLoss on drying\u003c\/td\u003e\n\u003ctd\u003e1.39% at 110°C \/ 1 hr (specification: \u0026lt; 3.0%)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"section\"\u003e\n    \u003cdiv class=\"heading\"\u003eKey features\u003c\/div\u003e\n    \u003cdiv class=\"feats\"\u003e\n      \u003cdiv class=\"feat\"\u003eHigh purity — verified spectrophotometric dye content of 97.3%, ensuring potent and reliable indicator solutions\u003c\/div\u003e\n      \u003cdiv class=\"feat\"\u003eSharp transition — confirmed pH 3.1 (pink) to 4.4 (orange-yellow) range for precise endpoint detection\u003c\/div\u003e\n      \u003cdiv class=\"feat\"\u003eExcellent solubility — dissolves completely to form a clear orange solution at 0.1% concentration\u003c\/div\u003e\n      \u003cdiv class=\"feat\"\u003eLow moisture — 1.39% loss on drying ensures a stable, free-flowing powder with long shelf life\u003c\/div\u003e\n      \u003cdiv class=\"feat\"\u003eConsistent spectrophotometric performance — absorptivity values within specification at both transition points\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"section\"\u003e\n    \u003cdiv class=\"heading\"\u003eCertificate of analysis — batch QC data\u003c\/div\u003e\n    \u003ctable class=\"coa-table\"\u003e\n      \u003ctr\u003e\n\u003cth\u003e#\u003c\/th\u003e\n\u003cth\u003eTest parameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eBatch result\u003c\/th\u003e\n\u003cth\u003eStatus\u003c\/th\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eOrange to yellow powder\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDark Orange Powder\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"pass\"\u003ePass\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eSolubility (0.1% in distilled water)\u003c\/td\u003e\n\u003ctd\u003eClear solution\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eOrange Solution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"pass\"\u003ePass\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003ctd\u003eTransition range\u003c\/td\u003e\n\u003ctd\u003epH 3.1 (Pink) – pH 4.4 (Orange-Yellow)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePasses test\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"pass\"\u003ePass\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e4a\u003c\/td\u003e\n\u003ctd\u003eAbsorptivity A(1%\/1cm) at pH 3.1 (λmax 504.2 nm)\u003c\/td\u003e\n\u003ctd\u003e1050 – 1150\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e1115\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"pass\"\u003ePass\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e4b\u003c\/td\u003e\n\u003ctd\u003eAbsorptivity A(1%\/1cm) at pH 4.4 (λmax 468.6 nm)\u003c\/td\u003e\n\u003ctd\u003e750 – 850\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e813\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"pass\"\u003ePass\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003eDye content (by spectrophotometry)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 95.0%\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e97.3%\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"pass\"\u003ePass\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003eLoss on drying (110°C \/ 1 hr)\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 3.0%\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e1.39%\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"pass\"\u003ePass\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/table\u003e\n    \u003cp style=\"font-size:12.5px;color:#2d5a3d;font-weight:500;margin:10px 0 0;\"\u003eConclusion: The sample COMPLIES with the specifications of the standard.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"section\"\u003e\n    \u003cdiv class=\"heading\"\u003eApplications\u003c\/div\u003e\n    \u003cdiv class=\"apps\"\u003e\n      \u003cdiv class=\"app\"\u003eAcid-base titrations — strong acids vs weak bases (HCl \/ Na₂CO₃)\u003c\/div\u003e\n      \u003cdiv class=\"app\"\u003eWater analysis — determination of alkalinity in water samples\u003c\/div\u003e\n      \u003cdiv class=\"app\"\u003eUniversity and industrial laboratory pH indication\u003c\/div\u003e\n      \u003cdiv class=\"app\"\u003eAnalytical chemistry research and education\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"section\"\u003e\n    \u003cdiv class=\"heading\"\u003eStorage\u003c\/div\u003e\n    \u003cdiv class=\"stor\"\u003e\n      \u003cdiv class=\"stor-item\"\u003eStore in a tightly closed container in a cool, dry place\u003c\/div\u003e\n      \u003cdiv class=\"stor-item\"\u003eProtect from direct light and UV exposure\u003c\/div\u003e\n      \u003cdiv class=\"stor-item\"\u003eStable under recommended storage conditions — refer to label for expiry\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"section\"\u003e\n    \u003cdiv class=\"heading\"\u003eSafety information\u003c\/div\u003e\n    \u003cdiv class=\"hazard\"\u003e\n      \u003cstrong\u003eWARNING — GHS Hazard Classification:\u003c\/strong\u003e H302 Harmful if swallowed · H319 Causes serious eye irritation.\u003cbr\u003e\n      Wear protective gloves and safety goggles. Avoid breathing dust. Do not eat, drink, or smoke when handling. Wash hands thoroughly after use. In case of eye contact, rinse immediately with water for at least 15 minutes and seek medical advice. Full Safety Data Sheet (SDS) available upon request.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"section\"\u003e\n    \u003cdiv class=\"heading\"\u003eIntended use\u003c\/div\u003e\n    \u003cdiv class=\"warn\"\u003e\n      This product is intended for laboratory analytical use only by qualified professionals. Not for use in human or veterinary therapeutic applications, food, feed, or pharmaceutical manufacturing.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"section\"\u003e\n    \u003cdiv class=\"heading\"\u003eQuality \u0026amp; compliance\u003c\/div\u003e\n    \u003cdiv class=\"notice\"\u003e\n      Manufactured and tested to laboratory reagent grade standards. Full batch-specific Certificate of Analysis (COA), Technical Data Sheet (TDS), and Safety Data Sheet (SDS) available upon request. For bulk quantities or contract pricing, contact \u003ca href=\"mailto:sales@ausamics.com\" style=\"color:#2d5a3d;font-weight:500;\"\u003esales@ausamics.com\u003c\/a\u003e.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"badges\"\u003e\n    \u003cdiv class=\"badge\"\u003e✓ Reagent grade\u003c\/div\u003e\n    \u003cdiv class=\"badge\"\u003e✓ COA available\u003c\/div\u003e\n    \u003cdiv class=\"badge\"\u003e✓ Ships from Australia\u003c\/div\u003e\n    \u003cdiv class=\"badge\"\u003e✓ 1–3 day delivery\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Ausamics Life Science","offers":[{"title":"25 g","offer_id":48285560733951,"sku":"ASD-633-25G","price":19.0,"currency_code":"AUD","in_stock":true},{"title":"50 g","offer_id":48285560766719,"sku":"ASD-633-50G","price":29.0,"currency_code":"AUD","in_stock":true},{"title":"100 g","offer_id":48285560799487,"sku":"ASD-633-100G","price":49.0,"currency_code":"AUD","in_stock":true},{"title":"250 g","offer_id":48285560832255,"sku":"ASD-633-250G","price":79.0,"currency_code":"AUD","in_stock":true},{"title":"500 g","offer_id":48285560865023,"sku":"ASD-633-500G","price":129.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0771\/1087\/0271\/files\/METHYLORANGE.jpg?v=1773394760","url":"https:\/\/ausamics.com.au\/products\/methyl-orange-indicator-pure","provider":"AuSaMicS","version":"1.0","type":"link"}