An oil sample had its iodine number determined using the pyridinium tribromide method. The sample and reagents used are as follows: Oil sample: 0.19 mL, density: 0.954 g/mL Pyridinium tribromide: 0.472 g Na2S203: 0.1 M, endpoint 27.68 mL %3D What is the approximate Bromine Number?
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- Please show all the calculations. I have these information available: 32.00 mL of 1 butanol and 20.00 mL glacial acetic acid were in the 100 mL distilling flask. Initial Aliquot:1 mL and add around 20 mL of water.Volume of NaoH required for titration: 67.3 mL After Aliquot:1 mL and add around 20 mL of water.Volume of NaOH required for titration: 23.4 mL Concentration of NaOH: 0.0972 MWhat is Solubility of phenazopyridine in water?acidic media? basic media ?and what is most common solvent?A 0.9056 g sample of KBrO3 (MM=167.0) was dissolved in dilute HCl and treated with an unmeasured excess of KI. The liberated iodine required 37.21 mL of Na2S2O3. Calculate the molar concentration of sodium thiosulfate. 1 mol BrO3- = 3 mol I2 = 6 mol S2O32- 0.8744 M 2.623 M 0.8791 M 0.2915 M
- Atomic weights are not provided, but please use rounded-off values to the nearest whole number.(examples: 24.305, use "24"; 107.8682, use "108"; 1.00784, use "1"; 15.999, use "16") Final answer in 3 decimal places 1. A fat sample with combination free fatty acids required 8mL and 5mL of standard hydrochloric acid for blank and sample titration, respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value. 2. A 500mg oil sample is taken from a conical flask and is dissolved in 50mL distilled alcohol. An indicator is added and is then titrated against 0.112N KOH until a slight pink color appears. It took 17.6mL of the titrant to reach the endpoint. What is the sample’s Acid Value?(9.29 × 105/8)-20.81 = with correct sig figsA 5.00-mL aliquot of a solution that contains 3.05 ppm Ni2+ is treated with an appropriate excess of 2,3-quinoxalinedithiol and diluted to 50.0 mL. The molar absorptivity of a Ni2+- 2,3-quinoxalinedithiol solution at 510 nm is 5520 L mol-1 cm-1. What is the absorbance of the above diluted Ni2+- 2,3-quinoxalinedithiol solution at 510 nm in a 1.00-cm cell?
- 19- A 25 mL liquid bleach sample is diluted with water to 1000 mL in a bubble gel. 25 mL of the diluted sample is transferred to the flask with a pipette, excess KI is added to it, and thus OCl- ion turns into Cl- ion and I2 is formed. The released iodine is titrated with 0.09892 M Na2S2O3 using the starch reagent, and 8.96 mL is required for the endpoint. Find the % NaOCl (w/v; w/v) in the bleach sample. (Na=23 g/mol, O= 16 g/mol, Cl = 35,44 g/mol)What is the role of Glycerin in the assay of Boric Acid?I. The reagent prevents the formation of pink color earlier than the expected endpoint.II. The reagent allows the reaction of protons from the acid sample with the hydroxyl ions from the titrant.III. It enhances the water solubility of the difficultly soluble boric acid. a. I, II & III b. II & III c. I & II d. I only e. I & IIIGiven the data, what is the unknown cation? test # reactions observations 1 reaction with HCI white precipitate formed 2 precipitate from HCI reaction & hot water white precipitate still in solution 3 precipitate from test 2 plus ammonia white precipitate still present and gray/black substance formed 4 supernantant from test 2 +K2CrO4 yellow precipitate formed 5 supernantant from test 3 plus HNO3 no reaction
- 1.1) What is the importance and uses of pure cobalt(II) sulphate? 1.2) Name the synthesis methods of cobalt(II) sulphate (CoSO4.7H2O). 1.3) Name the purification methods of cobalt(II) sulphate (CoSO4.7H2O).2.1) Propose synthesis methods for cobalt(II) sulphate (CoSO4.7H2O). 2.2) Propose purification methods for cobalt(II) sulphate (CoSO4.7H2O).The distribution ratio of iodine between an organic solvent and water is 8.00. If 50.0 mL of0.100 M aqueous iodine is shaken with 200 mL of the organic solvent until equilibrium isreached, how many milliliters of 0.0600 M Na2S2O3 is required to titrated a 25.0 mL aliquot ofthe organic phase?A 0.9000-g of KIO3 is dissolved in 500-mL distilled water. A 50.0-mL aliquot portion was run down into an Erlenmeyer flask and 2-g of KI and 2-mL of 6M HCl were added to it. Directly after, the solution was titrated with a 24.80-mL Na2S2O3 solution to a faint yellow solution. Starch TS was added to the resulting solution and the titration with the Na2S2O3 solution continued wherein an additional 1.33-mL was required to bring the blue color of the solution to disappear completely. MW: KIO3 = 214.0 g/mol ; Na2S2O3 = 158.1 g/mol Compute the N of the Na2S2O3 solution. None of the choices 0.09657 N 0.1075 N 0.1017 N