- Experiment Spectrophotometric Determination Of Fe A Using The Spectrophotometer 20d Absorbance Of The Various Solutio 1 (86.08 KiB) Viewed 115 times
- Experiment Spectrophotometric Determination Of Fe A Using The Spectrophotometer 20d Absorbance Of The Various Solutio 2 (89.21 KiB) Viewed 115 times
- Experiment Spectrophotometric Determination Of Fe A Using The Spectrophotometer 20d Absorbance Of The Various Solutio 3 (92.95 KiB) Viewed 115 times
- Experiment Spectrophotometric Determination Of Fe A Using The Spectrophotometer 20d Absorbance Of The Various Solutio 4 (102.03 KiB) Viewed 115 times
- Experiment Spectrophotometric Determination Of Fe A Using The Spectrophotometer 20d Absorbance Of The Various Solutio 5 (99.82 KiB) Viewed 115 times
Plot a graph using the conc-absorbance values in the table. Draw the best fitting straight line through the points - this is called the Beer- Lambert Law plot. CLS EN Abstance SIO 04 001 ud M before 4. Predict the molarity of the solution that shows an absorbance of 0.2062 5. What the specific roles of the following in the determination of Fe using 1,10-phenanthroline 1. Buffer: II. Hydroxyl Amine Hydrochloride: III. 1,10- Phenanthroline:
VA w 2. Which type of titration is used in experiment carried out in the lab by you 3. Explain the roles of Vitamin C solution, Starch and iodine solution in the redox titration 4. The amount of ascorbic acid in the sample you are about to titrate is 10 mg. How many moles of KIO3 are required to completely react with this sample? Hint: The titration of ascorbic acid with potassium iodate proceeds through a series of reactions: KIO; + 5K1 + 6H → 31, +6K+ + 3H20 [1] CH20. + 12 → C.H.O. + 21 + 2H+ [2] Use the following HINTS to identify the steps of calculation 1. How many moles of iodine produced in reaction (1) will be consumed by ascorbic acid in reaction [2]?!
II. There are 3 moles of iodine produced in reaction [1]. For all of them to be consumed, how many moles of ascorbic acid are required? III. 3 moles of ascorbic acid are consumed for each 1 mole of potassium iodate. I Based on these balanced reactions, what is the relationship between the moles of KIO, consumed and moles of ascorbic acid consumed? Experiment - Gravimetric Analysis Borax is a substance which is alkaline in nature and reacts with conc. Hcl to form Boric acid-soluble in hot water and insoluble in cold water Weight and dissolve 10 gm of Borax in 15 ml of distilled water. Add 7 ml of conc. HCl, mix thoroughly with glass rod and mark the original volume with glass rod. Evaporate the solution till the volume reduces to half of the original volume. Allow to cool at room temperature. Keep it aside for few min and add ice water. Filter the residue under suction and dry it in air. Weight the compound preparation. 1Na,B.07.10H,0 4H,BO, +5H,0 + 2Naci (Balanced Equation] Mol wt of Borax[Na,B,0.10H30] = 381.37gm Mol wt of Boric acid[H;BO) = 61.83gm
1Na,B,0,.10H20 -> 4H,BO, +5H20 + 2Naci [Balanced Equation] Mol wt of Borax[Na,B,0.10H20] = 381.37gm Mol wt of Boric acid[H2B03) = 61.83gm A. What would be the amount of Boric Acid precipitated at the end of the reaction? I B. What is the precipitating agent in this reaction? C. If 20 gms of Boric acid was obtained at the end of the gravimetric process, what would have been the initial amount of Borax taken Experiment:pH and Buffers You have been asked to design a buffer with a pH of 3.60 Akid Formula Chlorous Acid нско, 1110 136 Nitrous Acid HNO, 4610 3.14 Formic Acid COOR 1.810 94 Hints A. Which Acid will you select from the given acids B. What will be the Conjugate Base(CB) of the acid you have selected c. What is the concentration of the CB you have selected