This website uses cookies to ensure you have the best experience. Learn more

Analysis Of Vitamin C Content

703 words - 3 pages

Experiment V03 Analysis of commercial vitamin C tabletsChemicals: Vitamin C tablet, (1)standard 0.0110 M potassium iodate (KIO3) solution, (100 cm3)standard 0.060 M sodium thiosulphate solution, (Na2S2O3, 160 cm3)1 M potassium iodide solution, (KI, 20 cm3)0.5 M H2SO4, (150 cm3)freshly prepared starch solution.Apparatus: Titration apparatusPrinciple: In this experiment you are required to determine the vitamin C content of a commercial tablet and compare this with the manufacturer's specification.Vitamin C is ascorbic acid, which is rapidly and quantitatively oxidized by iodine in acidic solution according to the following equation:Ascorbic acidThe standard method for determination of ascorbic acid involves the direct titration of acidified sample with a standard iodine solution. But the low solubility of iodine makes this procedure less than ideal.The proposed experiment avoids these difficulties is by using the reaction between iodide (in excess) and iodate which generate a known excess quantity of iodine, and this excess iodine is back titrated with standard sodium thiosulphate solution.The reactions are as follows:IO3-(aq) + 5I-(aq) + 6H+(aq) (((( 3I2(aq) + 3H2O(l)I2(aq) + 2S2O32-(aq) (((( 2I-(aq) + S4O62-(aq)P.1Experiment V03 Analysis of commercial vitamin C tabletsProcedure:Dissolve the vitamin C tablet provided (Roche Vitamin C effervescent tablet, claimed to contain 1 g of ascorbic acid) in about 150 cm3 of 0.5 M sulphuric acid.Transfer the resulting solution to a clean volumetric flask and make up to 250 cm3 using distilled water.Pipette 25.0 cm3 of the vitamin C solution into a conical flask and add to it 5 cm3 of 1 M potassium iodide solution. Then pipette 25.0 cm3 of the standard KIO3 solution into the flask containing vitamin C and potassium iodide. The excess iodine is immediately back titrated with the standard sodium thiosulphate solution. Add a few drops of freshly prepared starch solution when the reaction mixture turns pale yellow and continue to titrate to the end point.Record your results into the following table:.Titration table
Titration

Trial

1

2

3

Final burette reading (cm3)

Initial burette reading (cm3)

Volume of Na2S2O3 added (cm3)

Average vol. of Na2S2O3 used =P.2Experiment V03...

Find Another Essay On analysis of vitamin c content

Content Analysis: An Examination of Web-based Orientation Materials

1767 words - 8 pages content provide to the learn? Method and Data Collection The purpose of this study is to investigate common themes in orientation materials. Because there is limited access to organizations’ orientation materials it is important to aggregate and analyze this information. The study will include a content analysis of organizations’ employee orientation materials. Each organization will be offered $100 compensation for access to their orientation

A Comparative Analysis into Oral and Topically Applying Vitamin A in the Topic of Photo Ageing

2077 words - 9 pages Voorhees, John (1996) Molecular Mechanisms of Retinoid Actions in Skin. The FASEB Journal [Internet], 10 (9), pp. 1-12. Available from: [Accessed 23rd March 2014]. Kafi, Reza et al (2007) Improvement of Naturally Aged Skin with Vitamin A (Retinol). Arch Dermatol [Internet], 143 (5), pp. 1-7. Available from:

Semiotics and analysis of newspaper cartoons and their media content

1908 words - 8 pages Semiotic Analysis of Media ContentPart APolitical cartoons, unlike written words can express a biased political opinion from the author to the reader. Because all opinions are implied rather than stated, the author cannot be quoted for a stance on political objectives. It is up to the reader to define their own individual attitude to the political topic at hand from their prior knowledge of the discourse surrounding the content as displayed by

A Content Analysis of Organizational Dissent as Portrayed on Primetime Television

2040 words - 8 pages Introduction There has been much research done on organizational dissent, but there is a dearth of research dedicated to how television shows portray dissent over the airwaves. In Deviating From the Script: A Content Analysis of Organizational Dissent as Portrayed on Primetime Television by Johny T. Garner, Emily S. Kinsky, Andrei C. Duta, and Julia Danker, the authors attempted to combine these two theories for their study. Using the data

Analysis of C. Van Woodward´s The Strange Career of Jim Crow

933 words - 4 pages C. Vann Woodward, who died in 1999 at the age of 91, was America's most Southern historian and the winner of a Pulitzer Prize, for Mary Chestnut's Civil War and he’s also a Bancroft Prize for The Origins of the New South. In honor to his long and adventurous career, Oxford is pleased to publish this special commemorative edition of Woodward's most influential work, The Strange Career of Jim Crow. The Strange Career of Jim Crow is one of the

Show how through an analysis of the content, language and style Eliot's "Preludes" is a reflection of its context

1040 words - 4 pages upon the context. Modernism was a rebellion against traditional attitudes, and as such it explored gender roles and sexuality much more explicitly than the previous periods. The idea of prostitution is a reflection upon this. This woman is clearly weary of her world and her life, as described through "You tossed a blanket from the bed". She is not content with having to resort to prostitution, and shows similar thoughts to that of the

Compare and contrast how content analysis and ethnographic research have been used to study children’s understanding of friendship

1618 words - 7 pages In recent years there have been a number of studies regarding how children perceive friendship (Brownlow, 2012). Children may have different understandings of what friendship means to them depending on their age or where they live. Two methods used in this field are content analysis and ethnology. This essay will illustrate the similarities and differences between the two methods through the work of two groups of researchers. Content

Chemistry rapport on deciding the amount of askorbinacid in c-vitamin pills

540 words - 2 pages Thomas Rasmussen 1.v Svendborg Gymnasium Kemi Rapport Afleveres den 17/05/01 Side PAGE 4 af NUMPAGES 4 Thomas Rasmussen 1.vHold: Jakob Svendsen-TuneForsøg udført d. 27/04Afleveres d. 17/05/01Svendborg GymnasiumFormål:At bestemme ascorbinsyre indholdet i C-vitaminpiller ved en syre-base titrering.Teori:Ascorbinsyre er et livsnødvendigt vitamin for visse abe arter, marsvin, flagermus, bestemte fiskear​ter og

Analysis Of The C++ Programming Language

1527 words - 6 pages AbstractC++ has had a phenomenal growth since it's beginnings in the early 1980's and has taken it's place as one of the premier programming languages in use today. This paper examines the history, purpose and expectations of the C++ language and emphasizes the Object Oriented basis that has made C++ so popular.Analysis Of The C++ Programming LanguageObject Oriented Programming (OOP) is a software development paradigm that has passed the test of

Review and Analysis of George C. Scott's Christmas Carol (1984)

996 words - 4 pages George C. Scott's Christmas Carol (1984) is a renowned and notable rendition of Charles Dickens's timeless classic, Christmas Carol. It tells a tale of a miserable and lonely man by the name of Ebenezer Scrooge. One Christmas night, cold-hearted Scrooge, who lacked the spirit of Christmas, is visited by three ghosts - the Ghost of Christmas Past, Christmas Present, and Christmas Yet to Come, respectively. The ghost of Christmas Past reminded

Society and Culture- Content Analysis of "The Gods Must Be Crazy"

2183 words - 9 pages The study of Society and Culture involves the exploration of the interactions between persons, society and culture in the environment through time. These interactions are quite evident and clearly displayed in the film "The Gods Must be Crazy". The intertwining connection/s between these fundamental concepts is shown through the portrayal of the two different societies; the tribes of the Kalahari and 'Western' society.The environment plays a big

Similar Essays

Analysis Of Commercial Vitamin C Tablets. (Ascorbic Acid Content In One Tablet)

1355 words - 5 pages until dark blue color has disappeared.11. Final Reading of the burette was recorded.12. Steps 5 to 11 was repeated 3 times.Determination of the Vitamin C content using standardized Sodium Thiosulphate solution13. A Vitamin C tablet was weighed and was put into a beaker.14. 150cm3 of 0.5M sulphuric acid was added into the beaker.15. Mixture was stirred until the tablet has dissolved completely.16. The solution was transferred into a 250cm3 volumetric

Vitamin C Content In Orange Juices

873 words - 3 pages Did you know? Vitamin C Saved 250,000 - 621,000 Lives (USA) in year 1999Aim; My aim is to find the product richest in Vitamin C out of the following;*Plunge Vitamin Water - 375 mL*Mr Juicy - 2 litre*Golden Circle Fizzy Orange - 1.5 litre*Fruitopia - 250 mL*Daily Juice - 1 Litre*Orange JuiceHypothesis; I think that the plain orange juice will be high in Vitamin C, but I think that the Fruitopia will be the highest. I think the 'Plunge' Vitamin

The Effect Of Three Conventional Cooking Methods On Vitamin C In Spinach

3577 words - 14 pages of spinach and water controlled. It is expected that the spinach that is boiled will retain the least amount of vitamin C due to vegetables losing "over one half of the total vitamin C content" (The World's Healthiest Foods, 2012) when cooked in water as a result of the nutrients in the vegetables breaking down when exposed to heat, consequently leaching out the nutrition and vitamin C into the cooking water (The Harvard Medical School, 2008

A Content Analysis Of Twitter’s Top Athletes

2074 words - 8 pages media relations. International Journal of Sport Communication, 6, 394-408. Giles, D. (2002). Parasocial interaction: A review of the literature and a model for future research. Media Psychology, 4, 279–305. Hambrick, M., Simmons, J., Greenhalgh, G. & Greenwell, C. (2010). Understanding professional athletes’ use of Twitter: A content analysis of athlete tweets. International Journal of Sport Communication, 3, 454–471. Hanzus, D. (2014). CFL