{"id":6616,"date":"2021-10-09T19:12:45","date_gmt":"2021-10-09T19:12:45","guid":{"rendered":"https:\/\/assignmenttutors.net\/blog\/chemistry-calculating-the-concentration-moles-of-solutions\/"},"modified":"2021-10-09T19:12:45","modified_gmt":"2021-10-09T19:12:45","slug":"chemistry-calculating-the-concentration-moles-of-solutions","status":"publish","type":"post","link":"https:\/\/assignmenttutors.net\/blog\/chemistry-calculating-the-concentration-moles-of-solutions\/","title":{"rendered":"Chemistry; calculating the concentration &#038; moles of solutions."},"content":{"rendered":"<div>\n<p>Just a coupe of uni level chem questions! If you have any issues especially in the second one, read the uploaded document to get an idea.<\/p>\n<p>\u00a0<\/p>\n<p>Question 1 \u2013 iodine solution standardisation:<\/p>\n<p>a) Calculate the mean (average) volume of the titre values you have chosen. Justify any exclusions you have made. [Average is found to be: 0.74 Litres]<\/p>\n<p>b) What is the number of moles of Vitamin C present in the 25.00mL you pipette into each conical flask?<\/p>\n<p>c) Using the balanced Equation C6H8O6 + I2 = C6H6O6 + 2I- + 2H+ , how many moles of iodine, I2, must have been present in the amount of iodine solution you titrated?<\/p>\n<p>d) Given this number of moles and the average titre value, what is the concentration of your iodine solution?<\/p>\n<p>\u00a0<\/p>\n<p>Question 2 \u2013 Apple juice investigation<\/p>\n<p>a) Calculate the number of moles of iodine, I2, that was involved during the redox reaction. (Hint: you are calculating n because you know c and V. What equation should you use? [n = CxV]<\/p>\n<p>b) The equation for the redox reaction between iodine and Vitamin C is provided again below. Using this balanced equation, how many moles of ascorbic acid (Vitamin C) in the apple juice reacted with the I2 on average in each titration? C6H8O6 + I2 = C6H6O6 + 2I\u2013 + 2H+<\/p>\n<p>c) Given the number of moles of ascorbic acid and original pipette volume, what is the concentration of Vitamin C in the apple juice you tested?<\/p>\n<p>d) The concentration you calculated in Part c) is in mol.L-1 . Convert your concentration from Part c) to g.L-1 (hint: What equation relates number of moles and mass?)<\/p>\n<p>e) Convert the concentration from Part d) to milligrams per litre (mg.L-1 )<\/p>\n<p>f) Now convert the concentration from Part e) to milligrams per 100 ml.<\/p>\n<p>g) How does your experimentally determined Vitamin C concentration compare with the value given on the juice bottle?<\/p>\n<p>h) List the experimental errors that could lead to a discrepancy between the determined and the advertised value.<\/p>\n<p>i) Considering your experimentally determined value and the possible sources of error, make a comment about the accuracy of the advertised amount of Vitamin C present.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Just a coupe of uni level chem questions! If you have any issues especially in the second one, read the uploaded document to get an idea. \u00a0 Question 1 \u2013 iodine solution standardisation: a) Calculate the mean (average) volume of the titre values you have chosen. Justify any exclusions you have made. [Average is found [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31],"tags":[],"class_list":["post-6616","post","type-post","status-publish","format-standard","hentry","category-homework-help"],"_links":{"self":[{"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/posts\/6616","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/comments?post=6616"}],"version-history":[{"count":0,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/posts\/6616\/revisions"}],"wp:attachment":[{"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/media?parent=6616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/categories?post=6616"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/tags?post=6616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}