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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- 1. A student synthesized 3.214g of Ni(NH3)„Cl2 from 4.023g of N¡C12•6H2O. He dissolved 0.81g of Ni(NH3)nCl2 in 40 mL of 1.0M HCI to make a sample for analysis. Molar mass: Ni 58.7; Cl2 71; NH3 1T; H2O 18. (1) A 0.20M Ni²* standard solution had an absorbance of 1.666, while his sample had an absorbance of 0.705. Calculate the Ni2+ concentration in his sample and the mass percent of Ni in the product. Note: A = ɛbc. (2) The student used 38.75 mL of 0.498M NaOH to neutralize excess HCl in 40mL of the sample. Calculate the mass percent of NH3 in the product.A second calibration standard solution of an iron(III) salicylate complex was prepared in two steps. First, 10.0 mL of a 0.100 M stock solution was added to 90.0 mL of solvent to make 100.0 mL of the first calibration standard solution and, secondly, 80 mL of that first calibration solution plus 20.0 mL of solvent were mixed to make the second calibration standard. What is the concentration of the second calibration standard solution?A student determines that the value of Ka for H2SO3 = 2.3×10-2 . What is the value of pKa?
- A 0.0715 g sample of a material was analyzed for thiourea (CS(NH2)2, MM = 76.12). It was found to consume 12.34 mL of 0.00543 M KBrO3 based on the reaction below: 3CS(NH2)2 + 4BrO3- + 3H2O ⇄ 3CO(NH2)2 + 3SO42- + 4Br- + 6H+ Calculate the mass of thiourea found in the sample. Group of answer choices 95.1 mg 6.80 mg 3.83 mg 0.0535 mgwater sample is determined through a spectrophotometric method based on the reaction of phosphate ion with molybdate ion, by originating a yellow complex. Calibration standards (P1 to P5) are prepared as follows: different volumes of a 102.2 mgL1 phosphate solution are added to several 100 mL volumetric 1. The content of phosphate in a flasks. Then, 10 mL of diluted HCI, 10 mL of 1% molybdate ion solution, and 10 mL of 0.75% oxalic acid solution are added to every flask, and finally water is added up to the volumetric mark. Samples are prepared in the same way, adding different sample volumes instead of phosphate standard solution. Absorbance of all solutions is measured at 360 nm, and the following data are obtained: Added volume Absorbance at 360 nm P1 2a 0.109 P2 5a 0.249 P3 10a 0.501 P4 15a 0.748 Р5 20a 1.008 Blank 0.000 Sample 20b 0.624 (a) mL of 102.2 mg L' phosphate standard solution. (b) mL of sample Calculate the concentration of phosphate in the water sample expressed in mg…5. (1) (ii) Ibuprofen (206.3 g/mol) absorbs at 255 nm and shows a molar absorptivity of 3010 L/mol.cm. A tablet of ibuprofen, 0.6654 g, was ground and 0.2203 g powder was dissolved in 20% methanol in a 100 mL volumetric flask (Solution A). Exactly 5.0 mL of Solution A was diluted in a 50.0 mL flask and the resulting solution showed an absorbance of 0.1228 AU in a 1.00 cm cell. (i) What is the concentration (mol/L) of ibuprofen in the 100 mL stock solution? (ii) Report the amount of ibuprofen in mg/Tablet. Ibuprofen H3C | HCCH; 1 H3C CH3 -CH-COOH
- One of the CHEM3341 student Ms. Fatima Al Wahaibi wanted to analyse phosphate ion concentration in Fertilizer industry wastewater sample collected from Rusayl Industrial Estate using spectrophotometer method. She mixed 200.00 mL of wastewater sample which contains only Na;PO, (unknown molarity) with 400.00 mL of 0.0200 M K,PO4 in a one liter beaker to make a Solution A. She then transferred 25.00 mL of Solution A to a 250.00 mL volumetric flask and added distilled water up to the calibration mark to make up Solution B. The Concentration of phosphate ions in Solution B is known to contain 3.00 x 103 mol/L from the spectrophotometric analysis at 460 nm using 1 cm cuvette. Calculate the concentration of phosphate ion in wastewater and how many phosphate ions are present in this wastewater.A 0.2985 g sample of an antibiotic powder was dissolved in HCl and the solution diluted to 100.0 mL. A 20.00 ml aliquot was transferred to a flask and followed by 25.00 ml of 0.01886 M KBRO3. An excess of KBr was added to form Br2, and the flask was stoppered. After 10 min, during which time the Br2 brominated the sulfanilamide, an excess of KI was added. The liberated iodine titrated with 12.88 ml of 0.1235 M sodium thiosulfate. Calculate the percent sulfanilamide (NH2C,H4SO2NH2) in the powder. Bro, + 5Br + 6H* 3Br, + 3H,0 NH2 NH2 Br. Br + 2B12 + 2H++ 2Br SO,NH2 SO,NH2 sulfanilamide Br, + 51 2Br + 12 excess 2 + 25,0,- 25,0,2 + 21- - MM: NH2C6H4SO2NH2 = 172.21 KBRO3 = 167.00 KBr 119.00A chemist obtained the following data for percent lindane in the triplicate analysis of an insecticide preparation: 7.23, 6.95, and 7.53%. Calculate the 90% confidence interval for the mean of the the three data, assuming that (a) the only information about the precision of the method is the precision for the three data. (b) on the basis of long experience with the method, it is believed that s---->σ lindane. (c) If s=0.28 is good estimate of σ, how many replicate measurement should be made in order for the mean for the analysis of sample to be within 0.2% of the true mean 90% of the time.
- Suzy Baker What two chemicals are incompatible with copper metal (used in Expt 5)? (refer to ACS Safety in the Academic Chemistry Laboratories, Vol. 1): [use the answer format= ans 1, ans 2]5 What is the atomic number of a neutral atom that has 8 neutrons and 7 electrons? a. 15b. 8c. 7d. 1 6 Methods that employ separation of the product chemically through precipitation, with purification, drying and weighing of the resultant product: A. Spectrophotometric analysisB. Volumetric analysisC. Gravimetric analysisD. Gasometric analysis7 Phase changes involving fusion, except:a. Solid to liquidb. Liquid to solidc. Gas to liquidd. Gas to solidGold can be determined in solutions containing high concentrations of diverse ions by ICP-AES. Aliquots of 50.0 mL of the sample solution were transferred to each of four 100.0 mL volumetric flasks. A solution was prepared containing 10.0 mg/L Au in 20% H2SO4 and quantities of this solution were added to the sample solutions to give 0, 2.5, 5, and 10 mg/L added Au in each of the flasks. The solutions were made up to a total volume of 100.0 mL, mixed, and analysed by ICP-AES. The resulting data are presented in the following table. Added Au, mg/L Emission Intensity Count 12,568 19,324 26,622 40,021 0.0 2.5 5.0 10.0 Calculate the concentration of gold in the original sample.