A 20.0 mL sample was analyzed using the Mohr method. Calculate the percent (w/v) Br- (FM = 79.90) if 25.00 mL of 0.1234 M AgNO3 was used to form the yellow-orange endpoint. Group of answer choices 80.9% 4.93% 12.3% 1.23%
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- Suppose that you are trying to measure the concentration of SO2 in air. To do that, you followed the para-rosaniline method. The SO2 was collected in a 10-ml solution of HgCl4 2- then diluted to 25 ml after the addition of the appropriate reagents. The absorbance owas measured at 650 nm in a 2.0-cm cell, yielding a value of 0.535. A standard sample was prepared by substituting a 1.00 mL sample of a standard solution containing the equivalent of 15.00 ppm SO2 for the airsample. The absorbance of the standard is found out to be 0.191. Report the concentration of SO2 in the air in parts per million. The density of air is 1.19 g/LHanna took a Chemistry exam. She was asked to calculate the ionization constant of acid FAM. For FAM, Λ0= 3.6298 x 105 μS/M-cm. Calculate the ionization constant of the compound with the given data below. Show complete solution. FAM + H2O ↔ FAM- + H3O+ Volume of FAM (9.00M) used, mL 5.00 Volume of water used, mL 1000.00 Conductivity Measurements, μS·cm-1 Water 5.00 Prepared FAM solution 209.00Explain how to obtain larger particles based on the relative supersaturation
- A sample of anhydrous Na2CO3 (FM = 105.989) is suspected to be contaminated with either NaHCO3 (FM = 84.007) or NaOH (FM = 39.997) To verify the suspicion, a 0.7483 g sample was dissolved to prepare a 50.00 mL solution, and a 10.00 mL aliquot was taken to prepare a 100 mL solution, where 25.00 mL was analyzed using single flask method. If the sample requires 27.50 mL of standard 0.0125 N HCl to reach the phenolphthalein endpoint and another 28.40 mL to reach the bromcresol green endpoint, calculate the percentage composition (in %w/w) of all the basic components in the sample.(Standard addition) Tooth enamel consists mainly of the mineral calcium hydroxyapatite, Ca10(PO4)6(OH)2. Trace elements in teeth of archeological specimen provide anthropologists with clues about diet and diseases of ancient people. Student at Dankook University measured the trace element strontium (Sr) in enamel from extracted wisdom teeth by atomic absorption spectroscopy. Solutions were prepared with a constant total volume of 10 mL containing 0.750 mg dissolved tooth enamel plus variable concentrations of added standard Sr. Added Standard Sr (ng/mL=ppb) 0 2.50 5.00 7.50 10.00 Emission Signal 28.0 34.3 42.8 51.5 58.6 (a) Make a graph showing the experimental data and the calculated straight line. (b) Find the concentration of Sr in the tooth ennamel in parts per million = μg/mL.A set of three replicate AAS measurements were made from the same calcium standard. Use the information below to determine the LOD for calcium analysis. ⚫ The standard was prepared by dissolving 0.020 g of CaCO, in acid and diluting to 1.000 L. ⚫ After blanking the instrument, the three absorbance readings from the standard were 0.101, 0.096, and 0.104. Hint: Determine the slope of a 'two-point' calibration plot using the blank and average reading of the standard; use the standard deviation of the 3 absorbance readings as s ( )4 ppm ( )3 ppm ( ) 1 ppm ( ) 0.2 ppm
- Barium sulfate from a 1.300-g sample was contaminated with 9.4 mg of Fe2(SO4)3 and weighed a total of 314.0 mg. Calculate a) the apparent percent BaSO4 (Apparent – the value of analyte concentration obtained when the interference is not considered) b) the true percent BaSO4In this experiment you will be preparing aqueous solutions of [Co(NH3)5N3]Cl2 at fixed concentrations. Given Mr ([Co(NH3)5N3]Cl2) = 257.01, what mass of [Co(NH3)5N3]Cl2 is required to prepare 10 mL of 0.0200 mol.dm-3 solution?A 30.00-L air sample was passed through an absorption tower containing a solution of Cd+2, where H2S was retained as CdS. The mixture was acidified and treated with 10.00 mL of 0.01070 M I2. After the reaction: S-2 + I2 S(s) + 2 I- was complete, the excess iodine was titrated with 12.85 mL of 0.01344 M thiosulfate. Calculate the concentration of H2S in ppm (w/w); use 1.20 g/L for the density of the gas stream. Molar Mass: H2S = 34.082
- 4. determine the amount in mg of the amount of Ag present from ICP mass digested: 1.0821g/L dilution of 10ml stock solution to 100ml volumetric flask X=0.98 (intensity)Analytical Chemistry True or False Absorption is the process by which ions are retained on the surface of a solid. Indicators produces an observable change in the solution or at near the equivalence point NaOH is a weak electrolyte The membrane of a borosilicate glass has an electrode has an resistance of 50-500M ohms. One of the requirements of a primary standard is having reasonably large molar mass to minimize relative error in weighing Hydrolysis occurs between a salt and water Occlusion is a type of coprecipitation in which a contaminant ion replaces an ion in the lattice of a crystal The precipitates form if the diameter of aggregates less than 10-4 cm Back Titration is a process by which a stoichiometrically equivalent quantity of standard solution is systematically added to a known quantity of sample Occlusion is a type of coprecipitation in which a contaminant ion replaces an ion in the lattice of a crystal Back Titration is a process by which a stoichiometrically equivalent…A sample of anhydrous NaHCO3 (FM = 84.007) is suspected to be contaminated with eitherNaOH (FM = 39.997) or Na2CO3 (FM = 105.989). To verify the suspicion, a 0.7483 g sample was dissolved to prepare a 50.00 mL solution, and a 10.00 mL aliquot was taken to prepare a 100 mL solution, where 25.00 mL was analyzed using double flask method. If the sample requires 0.45 mL of standard 0.0125 N HCl to reach the phenolphthalein endpoint and 35.95 mL to reach the bromcresol green endpoint, calculate the percentage composition (in %w/w) of all the basic components in the sample.
