B) Analysis of unknown aspirin tablet 1.Mass of aspirin tablet= 2.Concentration of ASA unknown from calibration curve = 3. .Conc of Stock ASA unknown = 50 ml / 1.5 ml (D.F) x Conc of ASA unknown=..... ...... mol/L 4. Moles of ASA in 100 ml solution = Concof Stock ASA unknownx 0.1 L = 5.Mass of ASA = moles ASA x Molar Mass ASA (180 g/mol) = 6.% of ASA in aspirin = Mass of ASA/ Mass of aspirin tablet x100 = mol/L ........... moles g .%
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- auDUIUance UI U.I JU ai 4JJ IIII III 1. UU CIII cuvclic. Calculate the molar absorptivity of the pigment at 453 nm? Q5) A student is tasked to determine the number of moles of H2SO4 (aq) in a 200 ml of an unknown solution. The student prepares a series of solutions with known concentrations of H2SO4 (ag) and measures the absorbance of each at an appropriate wavelength. These data are used to construct the calibration plot shown below. 1.00 0.80- 0.60 - 0.40- 0.20- 0.00- 3 x 10-4 6 x 10-4 Concentration (mol/L) If the absorbance of the unknown solution is 0.70, how many moles of H2SO4 (aq) does the 200 ml sample contain? AbsorbanceH4)ConsiteR the following Beaction: Pa,t 8 H,0→ Hy POqt 3 HCl IP 12.49 of | 10.09 of Hy O, what is the limiting Ctrl PCI, is PeacteD witn T0.0g Peactant ? Molar nhass of Pelg: 137.329/mel. holarmass of HoO=18:0291 mel malar mass of Hy POz =¢2.00 glmol molar mass of HCl= 35.4A16 glmel. %3DQ3/ Calculate the solubility of barium carbonate BaSO4 in a solution containing MgSO4 0.04M taking into consideration the activities. Compare the result if the effectiveness is not taken into consideration, KSP BaSO4 = 1.08 x 10 -10
- Solution: Kso=1.41-10-11 The resistance of a saturated solution of PbSO4 (very insoluble salt) at 291K is of 1.7x106 0, being the resistivity of pure water 7.1x105 Ocm. 1. Determine the solubility product of PBSO4 at 291K knowing that Am° (SO4 2)=136 0lcm?mol-1 and Am° (Pb+2)=122 o-lcm?mol-1, 2. How many centimeters will the ion move Pb+2 in one second when applying a potential difference of 25V between two electrodes 1 cm apart?3.) The following Beer's Law calibration plot was collected at 391.9 nm using the five mixtures listed above. The trendline equation was y = 4617.1x. A saturated solution of lead(II) chromate had an absorbance of 0.0025. Calculate its solubility, in molarity. Molar Solubility of PbCrO4: x 107 M ABSORBANCE VS CHROMATE CONCENTRATION AT 391.9 NM 1.40 1.20 y = 4617.1x R-0.9972 1.00 0.80 0.60 0.40 0.20 0.00 C 0.00005 0.0001 0.00015 0.0002 0.00025 0.0003 Chromate concentration (mol.L)The following data was obtained when four bottles of wine, were analyzed for residual sugar content and the results obtained are the followingB Bottles % w/v Residual Sugar 1 0.97, 0.86, 1.02 2 1.25, 1.32, 1.13, 1.20, 1.12 3 0.9, 0.92, 0.73 0.72, 0.77, 0.61,0.58 a) For each set, determine the mean, spread, standard deviation s and coefficient of variation. b) Calculate the pooled standard deviation, spooled. 2.
- Joint Package Course/28-11-2021 Paragraph for Questions 9 and TO স্ 9 एवं 10 के लिये अनुष्छेद At 298 K following observation was made for KCI solution Concentration (Mol/L) Am (S cm² mol) 0.01 0.04 123 112 298 K पर, KCI विलयन के लिए निम्न प्रेक्षण लिए गये सान्द्रता (MolL) Am (S cm² mol") 0.01 0.04 123 What is limiting molar conductance of KCI at 298 K (in S cm' mol) 112 298 K पर, KCI का सीमान्त मोलर चालकत्व (S cm' mol में) क्या है? (A) 134 (B) 145 (C) 150 (D) 166 10. Specific conductance of 0.25 M KCI solution at 298 K is (in S m) 298 K पर, 0.25 M KCI विलयन का विशिष्ट चालकत्व (S m में) हैं - (C) 0.01975 (D) 1.975 (A) 0.017 (B) 1.7 9.If 30.0 mL of water that is 0.0500 M in Q is to be extracted with four 10.0 mL portions ofan immiscible organic solvent, what is the minimum distribution coefficient that allowstransfer of all but 1.00 x 10–4 of the solute to the organic layer.Calculate the molar solubility of Zn(OH)2 in a solution of 0.0167 M K₂SO4.
- Volume of dye solution added (mL) 9.80 mL Concentration of bleach solution used (M) 0.090 M Volume of bleach solution added (mL) 0,20 mL. Total Volume of solution (mL) 10.0 mL O5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 ABS Ln Abs = -4.860e-2 t + 1.35e-1 0.0 INABS -0.2 -0.4 1/ABS -0.6 -0.8 -1.0 -1.2 -1.4 Time (s) -1.6 b) From the data above, what are the initial molar concentrations of [dye] and [bleach] for your experiment? (NOTE: The concentration of the stock yellow dye solution is 3.40x10 M) [dye)o (M) [bleach]o (M) In AbsorbanceTemperature Wavelength A 0.64 g sample containing KCI ( mw = 74.6 ) is dissolved in 50mL of water and titrated to the Ag2CrO4 end point, requiring 26.2 mL of 0.15 * ? M AGNO3 .The %w/w KCI in the sample is 4. %3D Non of these 58.6% 45.8% 25.2% Which of the following alcohols would be most soluble in * ?water Heptanol O Hexanol Ethanol O Pentanol If 20mL of a 0.40M Mg(OH)2 solution is used to titrate 25mL of HCIA dilute peroxide solution was prepared by quantitatively diluting 10 mL stock H2O2 (MW = 34.0147) to 250mL using a volumetric flask. 50 mL aliquot of the diluted peroxide solution was titrated using the previously standardized KMnO4 in problem 1. Titration of the sample required 29.00 mL titrant and the blank containing 50 mL 1:5 H2SO4 required 0.75 mL of the standard KMnO4. Calculate the concentration in %w/v of the stock H2O2. (Hint: H2O2 produces O2 under acidic condition). Follow sig. Fig