How to do titration calculations of vitamin C with iodine for IB Values taken from an experimental titration of vitamin C tablets using iodate done in an IB Chemistry practical. The iodate turns the KI solution to iodine I2. When all the vitamin C is used up the iodine can react with the starch to go blue. The calculations to go from iodate to vitamin C are detailed here including uncertainty propagation and percent error needed for the Internal Assessment in IB. 0:55 Explanation of method 3:50 Calculation of number of moles of iodate used 5:20 Mole ratio conversion from iodate to vitamin C 6:45 Determining total moles of vitamin C in tablet 7:55 Determining total mass of vitamin C in tablet 9:00 Determining the uncertainty (uncertainty propagation for precision) 10:05 Determining the percent error (accuracy) PPTs and quizzes are available on http://www.mrwengibchemistry.com/ Connect with me: Facebook: https://www.facebook.com/IBChemistry2016/ Twitter: https://twitter.com/andrewweng0406 Google plus: https://plus.google.com/u/0/108611113268141564345 Pinterest: https://www.pinterest.com/mrandrewweng040/ib-chemistry/ Weibo: http://www.weibo.com/5984983999/profile?topnav=1&wvr=6&is_all=1
Views: 21436 Andrew Weng
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Views: 2100 RMHSChem
Please note the following correction: in the table at 5:13, the answer to the final calculation, the mass of vitamin C in milligrams per gram of food, should be 0.11 (not 0.37 as stated in the table). The demonstration video showing how to take part in 'measuring vitamin C in food - a global experiment'. The video lists the equipment, the simple procedure and shows you how to enter your data to see the global picture
Views: 26733 Royal Society Of Chemistry
In this lab video, we'll go over the Vitamin C and briefly look at the techniques that you should know for this lab. This lab in particular requires some specific lab knowledge, most importantly reading a buret. To read a buret, start at the top and read to the bottom of the meniscus. Our lab burets read to the tenths place (0.0), so estimate to the hundredths place (0.00). Refer to the video for an example. Disclaimer- These videos are meant only to familiarize students with lab procedures. These videos should not be used as a substitute for actually attending the lab session. Actual lab procedures may vary depending on the instructor.
Views: 236 The Writing and Tutoring Center at TCC
Find out how much Vitamin C is in your favorite fruit juice using a redox indicator. This video is part of the Flinn Scientific Best Practices for Teaching Chemistry Video Series, a collection of over 125 hours of free professional development training for chemistry teachers - http://elearning.flinnsci.com ATTENTION: This demonstration is intended for and should only be performed by certified science instructors in a safe laboratory/classroom setting. Be sure to subscribe and check out more videos! Subscribe: https://www.youtube.com/channel/FlinnScientific/ Facebook: https://www.facebook.com/FlinnScientific/ Website: https://www.flinnsci.com/
Views: 69409 FlinnScientific
In the field of analytical chemistry, great stress is placed on the precision of results obtained using a specific method. However, there is always uncertainty associated with the reliability of the results. Uncertainty calculations must be taken into account for each step of the analytical process, and estimating these values increases confidence in the accuracy of a measurement result. Join Vanaja Sivakumar, PhD., and SPEX CertiPrep, as we explore the nature of uncertainty and quantify it to show how a measure of confidence can be placed on an analytical result. We will explain the process of identifying and calculating the components of uncertainty associated with analytical methods such as titration.
Views: 928 SPEX CertiPrep
IB Chemistry Biology on Vitamin C and ascorbic acid quantification using UV spectrophotometer. Vitamin C experiment
Views: 2981 wkkok1957
A preview of an experiment exploring the technique of titration, used to determine the ascorbic acid composition in a formulation, and to take one last opportunity to perfect your lab techniques prior to your exam.
Views: 840 Swinburne Commons
CHEMICALS: Vitamin C Tablets - 100 mg (1 per pair)***Make up these several hours before the lab -- put 1 100mg Vit. C tablet in a 100mL volumetric flask and fill about half way with DI water**** 1% Starch Solution Iodine Solution -- [500 mL 0.010 M KIO3 (2.14g KIO3/Liter H2O) + 20g KI + 250 mL of 0.3 M H2SO4 (16.5 mL conc. H2SO4/Liter H2O) dilute to 1 Liter **** Need 3 Liters**** 0.3 M H2SO4 -- make 2 liters (16.5 mL conc. H2SO4/Liter H2O) Juices - White Grape and White Cranberry - put out 1 bottle of each per class and the instructor can ask for more if needed MATERIALS AND EQUIPMENT: Filter Paper -- regular, not coarse Burets 100 mL Graduated Cylinders 100mL Beakers (4 boxes) Parafilm Scissors Extra 125 mL OR 250 mL Erlenmeyer Flasks (7 per pair) -- you can put out 250 mL flasks if needed WASTE BOTTLE
Views: 2958 Terry Patamawenu
• Preparation of phosphate buffer 0:35 • Sample preparation 05:08 • Test implementation / preparation of standard curve 11:41 Vitamins are present in a lot of food like juices, dairy products, baby food, cereals, sweets, tablets and vitamin mixtures. The analysis of added vitamin content is an important aspect of food safety. In this video, we show you the complete analysis procedure for the determination of the added vitamin content.
Views: 161 R-Biopharm AG
IB Chemistry How to do titrations 4 of 4 Calculations How the calculations for titrations - solution stoichiometry. This final experimental video for titrations ends with analysing the precision and accuracy for different strength standard solutions. The uncertainty propagation is demonstrated. These calculations are also useful for IB Chemistry experimental exam type questions. IB Chemistry Stoichiometry Solution practice problems: http://mrweng.weebly.com/1-stoichiometric-relationships.html Please see the previous 3 videos to see how the experiment was set up: IB Chemistry How to do titrations 1 of 4 Mass to concentration: https://youtu.be/-Hu1a_pKmcA IB Chemistry How to do titrations 2 of 4 Dilutions: https://youtu.be/ojkU6DaJU8A IB Chemistry How to do titrations 3 of 4 Performing the titration: https://youtu.be/6GphEdFZNxA PPTs and quizzes are available on http://mrweng.weebly.com/ Connect with me: Facebook: https://www.facebook.com/IBChemistry2016/ Twitter: https://twitter.com/andrewweng0406 Google plus: https://plus.google.com/u/0/108611113268141564345 Pinterest: https://www.pinterest.com/mrandrewweng040/ib-chemistry/
Views: 1211 Andrew Weng
A preview of an experiment using quantitative UV/visible spectroscopy for the analysis of sodium salicylate.
Views: 194 Swinburne Commons
Experiment bases made by: Royal Society of Chemistry, Global Experiment 2013. Measuring Vitamin C in food
Views: 1186 lettyag
UMass Lowell Clinical Laboratory & Nutritional Sciences undergraduate student Sandra Nabanja presents her research team's work on the retention of vitamin C in a variety of fruits and vegetables, including commonly used foods, such as apples, oranges, peas and broccoli. Using an HPLC system with electrochemical detection, they injected juices or extracts from these foods, and compared the peak area to a standard of known concentration. The vitamin C has a retention time of 5 minutes, making is simple and fast to collect vitamin C data. The HPLC peak areas allowed us to determine vitamin C concentration in mgs/100 grams material. The team believes consumers should pay more attention to vitamin C stability in foods, which cannot be assumed for lengthy periods of time. See also: http://www.uml.edu/research
Views: 490 umasslowell
Design of Experiment - Optimization of HPLC Analysis of Vitamin A and E in Margarine and Vegetable Oil
Views: 88 Research Media
Measuring Ascorbic Acid using High Performance Liquid Chromatography and Electrochemical Detection Systems (Recorded with http://screencast-o-matic.com) Citations: http://chem.libretexts.org/Core/Analytical_Chemistry/Instrumental_Analysis/Chromatography/High_performance_liquid_chromatography https://en.wikipedia.org/wiki/High-performance_liquid_chromatography https://www.youtube.com/watch?v=IUwRWn9pEdg https://www.myantec.com/support/tutorials/electrochemical-detection http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/Articleimage/2001/CS/b104827a/b104827a-s7.gif https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3787433/figure/f6-sensors-08-07097/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3787433/
Views: 120 Blaike Musso
This video demonstrates the analysis of glucose through a pair of redox titrations. First, the glucose solution is reacted with a known excess of triiodide. After a short reaction period the remaining triiodide is quantified through a titration with thiosulfate. The amount of glucose in the solution can be determined from the difference in the number of moles of triiodide used and the number of moles that reacted with thiosulfate. The endpoint of this titration is made visible through the addition of starch, which turns blue when complexed with triiodide.
Views: 22142 crharrison
Juice contents, total sugar and citric acid contents of various fruit juices. Acids of orange juice' organic how to extract the citric acid from lemons determination in fruit juices using hplc concordia quantitative assessment juice content, and ijensquantitative sugar vicky clarke's intolerance site foods chiark. The fruit juices that were tested included orange, sweet lime, lemon and grape. This citrus fruit packs a nutritional punch that makes it an excellent addition to most diets; However, the amount of acid in oranges can fruits, such as grapefruit, contain citric. Women's in biochemistry, it is important as an intermediate the citric acid cycle and therefore occurs metabolism of almost all living things. A naturally occurring acid found in many fruit juices, citric was quantified using external standards and high performance liquid chromatography (hplc). And vitamin c at a high content (usha, 2010)consume juice of fruits daily considering it beneficial for it's strongest in lemons and limes, which are up to 8. To extract the citric acid from a abstract. 08 to 1 percent citric acid. Googleusercontent searchoranges, round and segmented, are best known for their vitamin c properties. It has a very high concentration in lemons there can be as much 8 percent of citric acid the dry weight single lemon. Jpg] many people reading product ingredient lists see these three names quite often. Soft drinks depend on phosphoric acid for that extra bite, but orange juice actually contains higher levels than the predominating organic in is citric acid; But other acids tion of. All of these acids, if present in thejuice, would have an additive influ ence on the titratable acidity. It was therefore decided to determine the amounts ofcitric of pure citric acid would produce a much larger ratio m is an organic that most often found in citrus fruits. Citric acid in limes, lemons & oranges quantitative assessment of citric lemon juice, lime juice the how much is a grapefruit? What are levels different citrus fruits? How would i get percentage from orange after and kidney stones uw healthget fit jillian michaels. Many bottled fruit juices mimic the flavor of citrus by adding citric acid derived from fermented sugar. The fruit samples were brought at various intervals to laboratory of sbk. The acid has a distinctive sour taste, and because of this it is added to some foods drinks. Eight orange juice samples were analyzed ranging in concentrations from 36. It also serves citric acid exists in a variety of fruits and vegetables, but it is most concentrated lemons limes, where can comprise as much 8 percent the dry weight fruit dec 2015 quantitative assessment juice content, sugar content oranges, sweet lime, lemon grapes available fresh market minerals anti oxidants water. Lemons, oval and yellow, are also a segmented fruit that has 4 to 8 percent of citric acid by weight among fruits, is most concentrated in lemons limes, comprising as much. In this application note
Views: 134 Lyndia Ahlgren Tipz
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Views: 99 Amal Insyirah
This is a Chemistry practical we did at school. Purpose: To determine the the mass of Sulfur dioxide in wine by performing a redox titration. Theory On exposure to the air for several hours, wine acquires a 'vinegary' taste due to the oxidation of ethanol (the alcohol in the wine) to ethanoic (acetic) acid. Oxidation is caused by bacteria present in the wine as well ass by direct reaction of ethanol with oxygen in the atmosphere. The problem can be reduced by the addition of sulfur dioxide which acts as a reductant and also inhibits the action of the bacteria. Sulfur dioxide gas may be added directly as it is soluble in water. Alternatively, Sodium Metabisulfate (Na2S2O5) may be added to the wine; it reacts with the water and weak acids in wine to produce sulfur dioxide in solution. Further reactions may take place within the wine to 'fix' the sulfur dioxide in the form of 'bisulfite addition compounds'. In this experiment, Sodium Hydroxide solution is added to the aliquots of wine and the resultant mixture is left to stand in order to convert these bisulfite addition ions to Sulfite ions. Then, when Sulfuric Acid is added, sulfite and Hydrogen Sulfite ions are converted to Sulfur Dioxide in aqueous solution. In this way, all the Sulfur Dioxide initially added to the wine is available for titration against the standard solution of Iodine. The titration must be performed quickly to reduce the loss of Sulfur Dioxide gas. What is happening in the video: I didn't get enough time to record the titration from the bginning, the iodine we poor initially in the video is in reality the second time we drop it in, hence why when we stir the change doesn't fully occur. The liquid in the flask is a solution where we have wine and we have added Sulfuric Acid. Now what happens is we drop the Iodine and do the reaction. The goal is to get it to the equivelance point, which is where the solution starts to change colour (not too light though) which tells us all or almost all of the reactions has occured. Get it too light, there is room for more. Too dark (as happened here) and we have poored in more than we should have. We were supposed to add one more drop at the end but as you can see, more fell (this is why men should not do chemistry practicals) :)
Views: 1048 AlmondWillow
Website Sources (the links) http://www.webmd.com/vitamins-supplements/ingredientmono-1001-vitamin%20c%20(ascorbic%20acid).aspx?activeingredientid=1001&activeingredientname=vitamin%20c%20(ascorbic%20acid) https://www.nlm.nih.gov/medlineplus/ency/article/002404.htm https://en.wikipedia.org/wiki/Vitamin_C http://www.dsm.com/products/quali-c/en_US/vitamin-c/chemical-and-physical-properties.html https://umm.edu/health/medical/altmed/supplement/vitamin-c-ascorbic-acid Image Sources (con't) http://2012books.lardbucket.org/books/principles-of-general-chemistry-v1.0/section_08/c6e5188d5089d9d676e9d9a918a729cb.jpg http://images.parents.mdpcdn.com/sites/parents.com/files/styles/width_360/public/images/p_101423530.jpg http://www.womenshealthmag.com/sites/womenshealthmag.com/files/images/bruise-easily1.jpg https://41.media.tumblr.com/0cb68e1dfe5102b1bdacdf77257d0ab2/tumblr_mixv8yfknX1ric1juo1_500.jpg http://barin.liquidweb.com/~foodswot/wp-content/uploads/2012/01/tumblr_lxx4314Lkl1qk9tpg.jpg http://s1.favim.com/orig/150724/food-hawaii-hot-pineapple-Favim.com-3000410.jpg http://40.media.tumblr.com/tumblr_md8irm7SXE1rh000uo1_1280.jpg http://media.tumblr.com/tumblr_m7llrbKtqU1qdei8m.jpg http://barin.liquidweb.com/~foodswot/wp-content/uploads/2013/03/tumblr_inline_mjbs59M7Wi1qz4rgp.jpg http://www.homeopathytoday.org/wp-content/uploads/2012/02/pregnant-lady-on-lawn.jpg http://healthywealthyfood.com/wp-content/uploads/2015/09/1441466295_33.jpg http://gatewaynaturalmedicine.com/wp-content/uploads/2014/09/Australian-Skin-Institute-Vitamin-C-resized.jpg http://www.images-iherb.com/l/SOL-03275-1.jpg
Views: 228 Yuhan Sun
Starch iodine quantification using visible spectrophotometer
Views: 3524 wkkok1957