Determination of the ppm Fe in a water sample using the iron-phenanthroline method. Presence of suspended particles. ExBlank 1E+ Blank 1 Add your answer
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- The distribution constant for iodine between an organic solvent and water is 75. Find the concentration of I2 remaining in the aqueous layer after extraction of 100 mL of 1.50 x 10^-3 M I2 with the following quantities of the organic solvent: (a) 100 mL; (b) three 50 mL; (c) four 20 mL portions Note: Write the answer in (a), (b) then in (c) separated Use 2 decimal places only.You are given the suggestion that a 0.15 ppm quinine aqueous solution is a good concentration to shoot for in the experiments, but quinine fluoresces best when it is acidified to 0.10 M H2SO4. Describe how to make 100 mL of the recommended solution starting with quinine sulfate (actually, quinine hemisulfate salt monohydrate). Assume you also have 1.0 M sulfuric acid and de-ionized water.Explain why it is incorrect to collect data for temperatures above 100 C in terms of the solute to solvent ratio. Table 1: Temperature VS. solubility data for ammonium chloride. Test tube # g NH4Cl/10 mL H2O Crystallization temp. (ºC) 1 1.0 g/10 mL H2O 10 oC 2 1.8 g/10 mL H2O 20 oC 3 2.9 g/10 mL H2O 40 oC 4 3.8 g/10 mL H2O 65 oC 5 4.4 g/10 mL H2O 95 oC
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- Determine a procedure to accurately create a 1.5•10^-6 mg Fe/mL solution using a 0.0500 mg Fe/mL standard solution and only having access to 100.0 mL volumetric flasks and 1.00, 2.00, 3.00, 4.00, 5.00 and 10.00 mL volumetric pipets. (You may have it make more than one solution by dilution to accomplish this)In the ternary phase diagram experiment acetic acid (7.6 mL) and water (1.4 mL) mixture is titrated with chloroform until the solution is turbid. 12 mL chloroform is consumed to complete the titration. Calculate the final mass percentage of acetic acid. density of chloroform = 1.49 g/mL density of water= 1 g/mLdensity of acetic acid = 1.05 g/mL Mw of acetic acid = 60.05 g/mol5 mg of a protein is dissolved in 0.1 mL of distilled water (final volume) to give a final concentration of 0.5 mM. What is the molecular weight (in kDa) of the protein? Show your unit conversion step by step
- Please answer as soon as possible. Thank you! A 10.000-g cocoa powder sample was dissolved in concentrated acid and then diluted to 100.00 mL using distilled water. The solution was found to contain 5.45 uM Fe. Calculate concentration of Fe (MM: 55.845) in the cocoa powder sample in parts-per-million (ppm) (weight by volume).How to prepare these solutions? 250.0 mL 0.125 M stock Na2S2O3 solution from Na2S2O3·5H2O crystals 250 mL 0.10 M NaOHNOTE: Use the 1.0 M NaOH prepared250.0 mL standard 2500 ppm Cu(II) stock solutiona. Weigh and dissolve appropriate amount of Cu(NO3)2·5H2O crystals in enough distilled water.What is the total amount of compound you can recover after the first recrystallization of 5g impure N-Bromo succinimide (ca. 5% impurity) if you used 30 mL of water. (NBS solubility in hot water:2g/10mL and cold water 0.25g/10mL).