{"id":82068,"date":"2022-01-31T17:00:01","date_gmt":"2022-02-01T05:00:01","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=82068"},"modified":"2024-02-27T12:42:56","modified_gmt":"2024-02-27T07:12:56","slug":"determine-volumetrically-the-number-of-water-molecules-of-crystallisation-in-washing-soda","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-material\/determine-volumetrically-the-number-of-water-molecules-of-crystallisation-in-washing-soda\/","title":{"rendered":"Determine volumetrically the number of water molecules of crystallisation in washing soda"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/determine-volumetrically-the-number-of-water-molecules-of-crystallisation-in-washing-soda\/#Determine_volumetrically_the_value_of_n_ie_the_number_of_water_molecules_of_crystallisation_in_washing_soda_Na_2CO_3nH_2O_70_g_of_which_have_been_dissolved_per_litre_of_the_given_solution_Provided_fracM10_HCl\" title=\"Determine volumetrically, the value of \u2018n\u2019 i.e., the number of water molecules of crystallisation in washing soda \\(Na_{2}CO_{3}.nH_{2}O\\), 7.0 g of which have been dissolved per litre of the given solution. Provided \\(\\frac{M}{10} HCl\\)\">Determine volumetrically, the value of \u2018n\u2019 i.e., the number of water molecules of crystallisation in washing soda \\(Na_{2}CO_{3}.nH_{2}O\\), 7.0 g of which have been dissolved per litre of the given solution. Provided \\(\\frac{M}{10} HCl\\)<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/determine-volumetrically-the-number-of-water-molecules-of-crystallisation-in-washing-soda\/#Procedure\" title=\"Procedure\">Procedure<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/determine-volumetrically-the-number-of-water-molecules-of-crystallisation-in-washing-soda\/#Observations\" title=\"Observations\">Observations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/determine-volumetrically-the-number-of-water-molecules-of-crystallisation-in-washing-soda\/#Result\" title=\"Result\">Result<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Determine_volumetrically_the_value_of_n_ie_the_number_of_water_molecules_of_crystallisation_in_washing_soda_Na_2CO_3nH_2O_70_g_of_which_have_been_dissolved_per_litre_of_the_given_solution_Provided_fracM10_HCl\"><\/span><span style=\"color: #00ccff;\"><strong>Determine volumetrically, the value of \u2018n\u2019 i.e., the number of water molecules of crystallisation in washing soda \\(Na_{2}CO_{3}.nH_{2}O\\), 7.0 g of which have been dissolved per litre of the given solution. Provided \\(\\frac{M}{10} HCl\\)<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"color: #993366;\"><strong>Chemical Equation:<\/strong><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #993366;\">Indicator.<\/span><\/strong> Methyl orange.<br \/>\n<strong><span style=\"color: #993366;\">End Point.<\/span><\/strong> Yellow to light pink (Acid in burette)<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Procedure\"><\/span><span style=\"color: #0000ff;\"><strong>Procedure<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Rinse and fill the burette with the standard HCl solution.<\/li>\n<li>Rinse the pipette with the sodium carbonate solution and pipette out 20 ml of this solution in the titration flask.<\/li>\n<li>Add 2-3 drops of methyl orange indicator to the titration flask. The colour of the solution becomes yellow.<\/li>\n<li>Note the initial reading of the burette and run acid solution slowly in the titration flask till the solution becomes light pink.<\/li>\n<li>Note the final reading of the burette and find out the volume of acid used.<\/li>\n<li>Repeat the procedure 4-5 times to get a set of at least three concordant readings.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Observations\"><\/span><span style=\"color: #0000ff;\"><strong>Observations<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Molarity of given HCl solution = \\(\\frac{M}{10}\\)<\/p>\n<p>Volume of sodium carbonate solution taken for each titration = 20.0 ml<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong>S.No.<\/strong><\/td>\n<td><strong>Initial reading of the burette<\/strong><\/td>\n<td><strong>Final reading of the burette<\/strong><\/td>\n<td><strong>Volume of the acid solution used<\/strong><\/td>\n<\/tr>\n<tr>\n<td>1.<\/td>\n<td>\u2014<\/td>\n<td><strong> _<\/strong><\/td>\n<td>\u2014 ml<\/td>\n<\/tr>\n<tr>\n<td>2.<\/td>\n<td>\u2014<\/td>\n<td>\u2014<\/td>\n<td>\u2014 ml<\/td>\n<\/tr>\n<tr>\n<td>3.<\/td>\n<td>\u2014<\/td>\n<td>\u2014<\/td>\n<td>\u2014 ml<\/td>\n<\/tr>\n<tr>\n<td>4.<\/td>\n<td>\u2014<\/td>\n<td>\u2014<\/td>\n<td>\u2014 ml<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Concordant volume = x ml (say).<\/p>\n<p>Calculations<\/p>\n<p>The molarity of standard HCl = 0.1 M<\/p>\n<p>Since in the balanced equation two moles of HC1 react with one mole of Na<sub>2<\/sub>C0<sub>3<\/sub>.nH<sub>2<\/sub>0.<\/p>\n<p>\\(\\frac { { M }_{ HCl }\\times V_{ HCl } }{ { M }_{ { Na }_{ 2 }{ CO }_{ 3 } }\\times { V }_{ { Na }_{ 2 }{ CO }_{ 3 } } }==\\frac { 2 }{ 1 } \\)<\/p>\n<p>&nbsp;<\/p>\n<p>\\(\\frac { 0.1\\times x }{ { M }_{ { Na }_{ 2 }{ CO }_{ 3 } }\\times 20.0 } =\\frac { 2 }{ 1 } \\)<\/p>\n<p>&nbsp;<\/p>\n<p>\\({ M }_{ { Na }_{ 2 }{ CO }_{ 3 } }=\\frac { 1\\times x\\times 0.1 }{ 2\\times 20.0 } =\\frac { x }{ 400 } \\)<\/p>\n<p>&nbsp;<\/p>\n<p>\\({ M }_{ { Na }_{ 2 }{ CO }_{ 3 } }=\\frac { Streanth\\quad per\\quad litre }{ Molar\\quad mass\\quad of\\quad { Na }_{ 2 }{ CO }_{ 3 }.n{ H }_{ 2 }O } \\)<\/p>\n<p>&nbsp;<\/p>\n<p>\\(Molar\\quad mass\\quad of\\quad { Na }_{ 2 }{ CO }_{ 3 }.n{ H }_{ 2 }O=\\frac { Streanth\\quad per\\quad litre }{ { M }_{ { Na }_{ 2 }{ CO }_{ 3 } } } \\)<\/p>\n<p>&nbsp;<\/p>\n<p>\\(=\\frac { 7.0 }{ \\frac { x }{ 400 }  } \\quad g{ mol }^{ -1 }\\)<\/p>\n<p>&nbsp;<\/p>\n<p>But molar mass of hydrated sodium carbonate = (106 + 18n) g mol<sup>-1<\/sup><\/p>\n<p>therefore,<\/p>\n<p>\\(\\frac { 7.0 }{ \\frac { x }{ 400 }  } =108+18n\\)<\/p>\n<p>Knowing the titre value, x, the value of n can be calculated.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Result\"><\/span><span style=\"color: #0000ff;\"><strong>Result<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The number of the molecules of water of crystallisation in washing soda is \u2026..<br \/>\nNote. The result is expressed as nearest whole number. The value of n is 10 in this case.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Determine volumetrically, the value of \u2018n\u2019 i.e., the number of water molecules of crystallisation in washing soda \\(Na_{2}CO_{3}.nH_{2}O\\), 7.0 g [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"\"Get Determine volumetrically the number of water molecules of crystallisation in washing soda on Infinity learn\"","custom_permalink":"study-material\/determine-volumetrically-the-number-of-water-molecules-of-crystallisation-in-washing-soda\/"},"categories":[21],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Determine volumetrically the number of water molecules of crystallisation in washing soda - 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