Calculate the amount of vitamin C in your stock solution
(Berocca tablet) in mg. Take into account any dilutions you
made
I JUST WANT A STEP BY STEP EXAMPLE OF HOW TO CALCULATE he
amount of vitamin C in the stock solution (question 4) (Berocca
tablet) in mg.
Calculate The Amount Of Vitamin C In Your Stock Solution Berocca Tablet In Mg Take Into Account Any Dilutions You Mad 1 (86.78 KiB) Viewed 36 times
Part 1: Titrimetric Analysis of Vitamin C Tablets 1. Dissolve a single tablet in about 50 mL of deionised water in a small beaker. If needed, use a stirring rod to help crush the tablet and speed up its dissolution. Thoroughly mix the beaker content. 2- Carefully transfer the solution quantitatively into a 100 mL volumetric flask and rinse the beaker with two 10 mL portions of deionised water and transfer both rinses into the volumetric flask. 3- Stopper the flask, thoroughly mix the solution, and make up the volume to the calibration mark with deionised water. Stopper the flask again and mix the contents well. This first flask consists of your stock vitamin C solution. The concentration of vitamin C in this solution is approximately 0.500 g/100 mL (500 mg/100 mL). Handy Tip: DO NOT rush into filling the volumetric flask to the mark until you make sure you mixed the content well for proper sample dissolution. If you fill the volumetric flask immediately to the mark with solvent, you will have limited airspace which will decrease the efficiency of the drug dissolution process. On the contrary, when the flask is partially filled, there will be enough airspace for the solution to move around which will enhance the mixing process. School of Molecular and Life Sciences BIOL1004 Foundations of Bioscience Practice: Determination of Vitamin C in Fruit Juice 39 4. Use a volumetric pipette to transfer 5.00 mL of this solution into a clean or pre-rinsed 250 mL conical flask. 5. Add 45 mL deionised water to bring the total volume of the flask to 50 mL (Diluted Solution) 6- Add 1 teaspoonful of solid starch powder indicator to the diluted solution and swirl well to mix. 7- Titrate the sample with the provided standardised iodine solution (0.005 mol L- iodine). The endpoint of the titration is identified as the first permanent trace of a dark blue-black colour due to the starch-iodine complex 8. If possible, repeat the titrations with further aliquots of sample solutions until you obtain concordant results (titres agreeing within 0.1 mL). 9. Record all data collected in the table below.
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