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- Exactly 6.00 ml of acetic acid (density = 1.05 g/mL), MW =60.05) was added to a 1 –liter volumetric flask, and the flask was filled to the mark with distilled water. A portion of the resulting solution was added to a conductance cell (k = 1.25 cm-1), and the conductance was found to be 416 μS. Calculate the dissociation constant Ka of acetic acid. ΛoH+= 349.8 Scm2/mole and ΛoCH3COO- = 41 Scm2/moleWhat is ΔHsys for a reaction at 16.9 °C with ΔSsurr = -159 J mol-1 K-1 ? Express your answer in kJ mol-1 to at least two significant figures. (Please type answer no write by hend)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
- Give me answer ofd and eBetnovate-RD® contains 0.025% w/w betamethasone valerate in a water-miscible basis. How much betamethasone valerate is contained in a 100g tube?A 50.00mL sample with BaCl2 was diluted to 650 mL. Aliquots of 100.00 mL of this solution were analysed using Mohr and Volhard methods. The following data were obtained. Volhard method: Volume of AgNO3 = 100mL; Volume of KSCN = 18.25mL Mohr Method: volume of AgNO3: sample = 27.80mL (blank) = 0.30mLWhat is the %BaCl2 using Mohr and Volhard Method. Concentration of KSCN: 0.04000M Concentration of AgNO3: 0.03000M
- 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%Why is glass better than fused silica as a prism construction material for a monochromator to be used in the region of 400 to 80 nm?The accompanying data (1.00-cm cells) were obtained for the spectrophotometric titration 10.00 mL of Pd(II) with 2.44 10-4 M Nitroso R(O. W Rollins and M. M. Oldham, Anal. chem .,1971, 43, 262, DOI: 10.1021/ac60297a026). Calculate the concentration of the Pd(II) solution, given that the ligand-to-cation ratio in the colored product is 2:1
- A 5.00-mL sample of blood was treated with trichloroacetic acid to precipitate proteins. After centrifugation, the resulting solution was brought to pH 3 and extracted with two 5-mL portions of methyl isobutyl ketone containing the lead-complexing agent APCD. The extract was aspirated directly into an air/acetylene flame and yielded an absorbance of 0.527 at 283.3 nm. Five-milliliter aliquots of standard solutions containing 0.400 and 0.600 ppm of lead were treated in the same way and yielded absorbances of 0.396 and 0.599. Find the concentration of lead in the sample in ppm assuming that Beer’s law is followed.A 5.00-mL sample of blood was treated with trichloroacetic acid to precipitate proteins. After centrifugation, the resulting solution was brought to pH 3 and extracted with two 5-mL portions of methyl isobutyl ketone containing the lead-complexing agent APCD. The extract was aspirated directly into an air/acetylene flame and yielded an absorbance of 0.569 at 283.3 nm. Five-milliliter aliquots of standard solutions containing 0.400 and 0.600 ppm of lead were treated in the same way and yielded absorbances of 0.396 and 0.599. Please calculate the concentration of lead in the sample in ppm.In coulometric karl Fisher water analysis, 25.0 mL of pure “dry” methanol required 4.23 C to generate enough I2 to react with residual H2O in methanol. A suspension of 0.8476 g of finely ground polymeric material in 25.0 mL of the same “dry” methanol required 63.16 C. Find the weight percent of water in the polymer.