CHEMISTRY 221 LABORATORY�QUANTITATIVE ANALYSIS EXPERIMENT: DETERMINATION OF ASCORBIC ACID IN VITAMIN C TABLETS THEORY: Ascorbic acid‚ C6H8O6‚ MM = 176.13‚ can be oxidized to form dehydroascorbic acid by bromine via the following reaction: The bromine or iodine used in the titration is generated by adding an excess amount of KBr or KI to an acidified solution of the sample according to the following reaction: BrO3- + 5 Br- + 6 H+ 3 Br2 + 3 H2O IO3- + 5 I- + 6 H+
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Investigating the vitamin C content of fruits and fruit juice Aim: In this investigation‚ I aim to measure and compare whether there is a higher content of vitamin C in a fruit or a juice by measuring the volume of the sample required to decolourise a solution of dichlorophenolindophenol (DCPIP). Introduction: For this experiment‚ I aim to investigate and compare the content of vitamin C in the fruit against the fruit juice. The theory of this method is a titration with dichlorophenolindophenol
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Biology Lab – Vitamin C content of food Aim: To compare the vitamin C content of different fruits using the decolourisation of DCPIP from blue to clear as the indicator. • You first need to estimate the volume of a known concentration of vitamin C solution required to decolourise 2 cm3 of DCPIP solution. • Then you need to determine the volume of fruit juice that decolourises 2 cm3 of DCPIP solution. This gives an estimate of the concentration of vitamin C in fruit juice. • This value
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2004 Objective: 1. To standardize sodium thiosulphate for titration use. 2. To find out the concentration of Vitamin C in the tablet. Theory: This experiment involves titration of redox reaction. Redox reaction means reduction and oxidation. In which oxidizing agent and reducing agent are mixed and oxidize/reduce each other. One losses electron(s) and increase in oxidation number when is oxidized‚ and vice versa. In order to find out concentration of the ascorbic acid in the tablet‚ a redox
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Determination of Vitamin C by an Iodometric Titration Purpose: The goal of this lab is to determine the concentration of vitamin C in juices and Real Lemon. A redox titration‚ involving an iodometric method‚ will be used to do the analysis. The samples will be classified by their Vitamin C content. Introduction: Although most mammals can synthesize vitamin C‚ or ascorbic acid (C6H8O6)‚ from sugars‚ man must ingest considerable quantities of this substance. The National Academy of Sciences recommends
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November 24‚ 2009 The Juice industry in Mexico have been increasing‚ there are several factors that make this possible and companies like Jugos del Valle and Jumex are making different strategies to capture that market. Next there is an analysis of the industry and then it follow an internal and external analysis of Jugos del Valle‚ which is now part of Coca-Cola FEMSA. There are some aspects that are favorable for the company and some that are disadvantages for them. The purpose of this essay
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question‚ or topic‚ was “Does the level of vitamin C change over time in Orange Juice.” After I viewed the website‚ I got very excited because it had simple step-by-step instructions about how to test the level of vitamin C. On the following page are the directions. I think I am really excited to do this project because it sounds very interesting and fun to do. I hope to prove what the driving question/topic entails. Paragraph 2 – Background (5 Facts) • Vitamin C helps to repair and regenerate tissues
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Asparagus Delight Juicing Recipes Juice Recipe: 4 asparagus spears‚ 3 carrots and 2 celery ribs. Simple Asparagus Juicing Recipes - 6 asparagus spears‚ 3 celery ribs‚ handful of cilantro Pepper Beets Juice Recipe: 1/2 beet with green root‚ 3 carrots‚ 1/2 red bell pepper Beeting it with Cilantro Juice Recipe: 1/2 beet with green root‚ 3 carrots‚ handful of cilantro Sweet Beets Juice recipe: 1/2 beet with green root‚ 1 sweet potato‚ 2 apples Broccoli Sunrise Juice Recipe: 1 broccoli spear‚ 4 carrots
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Lab Report: MEASUREMENT OF VITAMIN C Introduction Nutritional diseases were once the number one cause of death only a century ago‚ but rarely affect our lives today. The complete lack of vitamin C (ascorbic acid) characterized by dark purple spots on the skin and rotting gums‚ a disease called scurvy‚ took the lives of many sailors up until the mid 1800s when the prevention was discovered. Consequently‚ British sailors became referred to as ‘limeys’ because of their daily habit of eating
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To compare the concentration of vitamin C in different brands of orange juice. Juice sample provided: 0.1% vitamin C solution‚ fresh orange juice‚ You C 1000 orange water. Aim of investigation: To compare and verify the amount of vitamin C in Mr. Juicy and You C 1000 orange juice. Introduction: Problem: To compare the concentration of vitamin C Hypothesis: Concentration of vitamin C in Mr. Juicy is about 0.02 % Concentration of vitamin C in You C 1000 orange water is about 0.1%
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