{"id":32907,"date":"2025-06-23T03:32:36","date_gmt":"2025-06-23T03:32:36","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=32907"},"modified":"2025-06-23T03:32:37","modified_gmt":"2025-06-23T03:32:37","slug":"benzoic-acid-properties-melting-point-121-125-ac","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/benzoic-acid-properties-melting-point-121-125-ac\/","title":{"rendered":"Benzoic acid Properties Melting point: 121-125 \u00c2\u00b0C"},"content":{"rendered":"\n<p>Benzoic acid Properties Melting point: 121-125 \u00c2\u00b0C (lit) Boiling point: 249 \u00c2\u00b0C (lit) Density: 4.21 (vs air) Vapor density: 10 mm Hg at 132 \u00c2\u00b0C Vapor pressure: 2131 Refractive index Flash point: 250 \u00c2\u00b0F Storage temp: Store at RT Solubility: soluble; clear; colorless (95% ethanol, 1g\/3mL) Solid solubility: 4.19 (at 25\u00c2\u00b0C) Pka: 2.5-3.5 (H2O, 20\u00c2\u00b0C saturated solution) Form: White to yellow-beige to orange Color: Slightly soluble Water solubility: 0.34 g\/100 mL JECFA Number: 850 Merck BRN: 636131 Henrys Law Constant: 7.02 x 10^-8 atm\u00c2\u00b7m^3\/mol Stability: Stable CAS DataBase Reference: 85-09-0 NIST Chambala Rule: 1091<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>The properties of <strong>Benzoic Acid<\/strong> are summarized below, along with an explanation:<\/p>\n\n\n\n<p><strong>Key Properties:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Melting Point:<\/strong> 121 to 125 \u00b0C (literature value)<\/li>\n\n\n\n<li><strong>Boiling Point:<\/strong> 249 \u00b0C (literature value)<\/li>\n\n\n\n<li><strong>Density (compared to air):<\/strong> 4.21<\/li>\n\n\n\n<li><strong>Vapor Density:<\/strong> 10 mm Hg at 132 \u00b0C<\/li>\n\n\n\n<li><strong>Vapor Pressure:<\/strong> 2131 (units not specified, likely in Pascal or mm Hg at given conditions)<\/li>\n\n\n\n<li><strong>Refractive Index:<\/strong> Not provided explicitly<\/li>\n\n\n\n<li><strong>Flash Point:<\/strong> 250 \u00b0F<\/li>\n\n\n\n<li><strong>Storage Temperature:<\/strong> Store at room temperature<\/li>\n\n\n\n<li><strong>Ethanol Solubility:<\/strong> Soluble; forms a clear, colorless solution with 95 percent ethanol at 1g per 3mL<\/li>\n\n\n\n<li><strong>Solid Solubility:<\/strong> 4.19 at 25 \u00b0C (likely grams per 100mL in a specified solvent)<\/li>\n\n\n\n<li><strong>pKa:<\/strong> Between 2.5 to 3.5 in water at 20 \u00b0C using a saturated solution<\/li>\n\n\n\n<li><strong>Physical Form:<\/strong> White to yellow-beige to orange solid<\/li>\n\n\n\n<li><strong>Color:<\/strong> Slightly soluble in water<\/li>\n\n\n\n<li><strong>Water Solubility:<\/strong> 0.34 grams per 100mL<\/li>\n\n\n\n<li><strong>JECFA Number:<\/strong> 850<\/li>\n\n\n\n<li><strong>Merck BRN:<\/strong> 636131<\/li>\n\n\n\n<li><strong>Henry&#8217;s Law Constant:<\/strong> 7.02 x 10\u207b\u2078 atm\u00b7m\u00b3\/mol<\/li>\n\n\n\n<li><strong>Stability:<\/strong> Stable under normal conditions<\/li>\n\n\n\n<li><strong>CAS Number:<\/strong> 85-09-0<\/li>\n\n\n\n<li><strong>NIST Reference (Chambala Rule):<\/strong> 1091<\/li>\n<\/ul>\n\n\n\n<p><strong>Explanation:<\/strong><\/p>\n\n\n\n<p>Benzoic acid is a widely used organic compound and serves as a fundamental carboxylic acid in both laboratory and industrial applications. Its relatively low <strong>melting point<\/strong> of 121 to 125 \u00b0C allows it to be easily purified by recrystallization. The <strong>boiling point<\/strong> of 249 \u00b0C indicates its thermal stability, making it suitable for moderate heating without decomposition.<\/p>\n\n\n\n<p>The compound is only <strong>slightly soluble in water<\/strong> (0.34 g\/100 mL), but much more soluble in organic solvents like ethanol. This property is important for extraction and purification processes. Its <strong>pKa<\/strong> between 2.5 to 3.5 reflects its weak acidic nature, common for carboxylic acids, allowing it to participate in acid-base reactions.<\/p>\n\n\n\n<p>The <strong>vapor density<\/strong> and <strong>vapor pressure<\/strong> indicate moderate volatility under heating. The <strong>flash point<\/strong> of 250 \u00b0F highlights the temperature at which vapors can ignite, informing safety protocols.<\/p>\n\n\n\n<p>It exists in solid form, ranging from white to beige or orange, depending on purity or storage conditions. The <strong>Henry&#8217;s Law constant<\/strong> suggests very low volatility from aqueous solutions, which is beneficial in environmental contexts as it limits air contamination.<\/p>\n\n\n\n<p>Overall, benzoic acid&#8217;s stability, moderate acidity, and solubility profile make it valuable in food preservation, pharmaceuticals, and as an intermediate in organic synthesis.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"852\" height=\"1024\" src=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-449.jpeg\" alt=\"\" class=\"wp-image-32908\" srcset=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-449.jpeg 852w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-449-250x300.jpeg 250w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-449-768x923.jpeg 768w\" sizes=\"auto, (max-width: 852px) 100vw, 852px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Benzoic acid Properties Melting point: 121-125 \u00c2\u00b0C (lit) Boiling point: 249 \u00c2\u00b0C (lit) Density: 4.21 (vs air) Vapor density: 10 mm Hg at 132 \u00c2\u00b0C Vapor pressure: 2131 Refractive index Flash point: 250 \u00c2\u00b0F Storage temp: Store at RT Solubility: soluble; clear; colorless (95% ethanol, 1g\/3mL) Solid solubility: 4.19 (at 25\u00c2\u00b0C) Pka: 2.5-3.5 (H2O, 20\u00c2\u00b0C [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-32907","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/32907","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=32907"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/32907\/revisions"}],"predecessor-version":[{"id":32909,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/32907\/revisions\/32909"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=32907"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=32907"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=32907"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}