{"id":40405,"date":"2025-06-27T17:22:24","date_gmt":"2025-06-27T17:22:24","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=40405"},"modified":"2025-06-27T17:22:28","modified_gmt":"2025-06-27T17:22:28","slug":"a-25-0ml-sample-of-a-solution-of-an-unknown-compound-is-titrated-with-a-0-115m-naoh-solution","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/a-25-0ml-sample-of-a-solution-of-an-unknown-compound-is-titrated-with-a-0-115m-naoh-solution\/","title":{"rendered":"A 25.0mL sample of a solution of an unknown compound is titrated with a 0.115M NaOH solution"},"content":{"rendered":"\n<p>A 25.0mL sample of a solution of an unknown compound is titrated with a 0.115M NaOH solution. The following titration curve is obtained. The unknown compound is <strong><em><strong><em>_____<\/em><\/strong><\/em><\/strong>. <\/p>\n\n\n\n<p>options:A) a weak acidB) a strong acidC) a strong baseD) neither an acid nor a baseE) a weak base<\/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><strong>Correct Answer: A) a weak acid<\/strong><\/p>\n\n\n\n<p>To determine the identity of the unknown compound in a titration, the titration curve provides crucial information about the pH changes as a titrant is added. In this case, the titrant is a 0.115 M NaOH solution, which is a strong base. The NaOH reacts with the unknown compound, and the resulting pH changes are plotted to generate a titration curve.<\/p>\n\n\n\n<p>If the unknown compound were a <strong>strong acid<\/strong>, the initial pH would be very low (close to 1), and the pH would rise sharply and almost vertically at the equivalence point. The equivalence point for a strong acid\u2013strong base titration occurs at pH 7.<\/p>\n\n\n\n<p>If the unknown compound were a <strong>weak acid<\/strong>, the titration curve would begin at a moderately low pH (typically between 3 and 5), and the curve would rise more gradually. The key feature would be a <strong>buffering region<\/strong> in the beginning, followed by a more gradual increase in pH. The <strong>equivalence point<\/strong> for a weak acid titrated with a strong base typically occurs <strong>above pH 7<\/strong>, often between 8 and 9. The presence of this shift indicates the acid was not fully dissociated to start with, which is a characteristic of weak acids.<\/p>\n\n\n\n<p>If the unknown were a <strong>strong base<\/strong>, the titration would begin at a very high pH and decrease as a strong acid is added, which does not match this setup. A <strong>weak base<\/strong> titrated with a strong acid would have a starting pH in the range of 9 to 11 and an equivalence point below pH 7.<\/p>\n\n\n\n<p>If the compound were <strong>neither an acid nor a base<\/strong>, the pH would not change significantly during titration.<\/p>\n\n\n\n<p>Given that NaOH is used and a titration curve is observed with a gradual rise and an equivalence point above pH 7, the unknown compound is best identified as a <strong>weak acid<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A 25.0mL sample of a solution of an unknown compound is titrated with a 0.115M NaOH solution. The following titration curve is obtained. The unknown compound is _____. options:A) a weak acidB) a strong acidC) a strong baseD) neither an acid nor a baseE) a weak base The correct answer and explanation is: Correct Answer: [&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-40405","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/40405","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=40405"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/40405\/revisions"}],"predecessor-version":[{"id":40406,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/40405\/revisions\/40406"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=40405"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=40405"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=40405"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}