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- 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 2:1To the nearest whole wavenumber, predict the value of delta tet for a tetraquenickel(II) complex and compare its CFSE to the hexaquanickel(II) complexWhy is it necessary to buffer a solution with sodium acetate in spectrophotometric determination of iron in FAS
- The ESI mass spectrum (positive mode) of the complexshown below contained a peak envelope with m/z527.9 (100%), 528.9 (15%), 529.9 (46%), 530.9(7%), 531.9 (0.5%). A group of peaks of lowintensity and with spacings of m/z ¼ 1 was alsoobserved around m/z 994. (a) What is the oxidationstate of Cu in the complex? (b) Assign the majorpeak and account for the isotope pattern. (c) Suggesthow the minor peak arises. [The mass spectrum of the complex complex is shown on pic.]A 25 ml solution of unkown containing Fe+3 and Ca+2 required 16.06 ml of 0.051 M EDTA for complete the reaction. A 50 ml of the same of the unkown was treated with NH4F to protect Fe+3. then the Ca+2 was reduced and masked by addition thiourea. upon addition of 25 ml of 0.051 M EDTA, the Fe+3 was liberated fron its floride complex and formed EDTA complex . the excess ETDA required 19.77 ml of 0.01883 M pb+2 to reach the end point by using xylenol orange indicator. Find the concentarion of Ca+2 in the unkown sample?An aqueous solution of sodium hexaiodoplatinate(IV) isblack. What conclusions can be drawn about the absorption spectrum of the [PtI6]2- complex ion?
- A calibration curve for the colormetric determination of phosphorusin urine is prepared by reacting standard solutions of phosphate withmolybdenum (IV) and reducing the phosphomolybdic acid complex toproduce the characteristic blue color. The measured absorbance A isplotted against the concentration of phosphorus. From the followingdata, determine the linear least-squares line and calculate thephosphorus concentration in the urine sample.a. Use the method of least squares to determine the equation of the line in the form of y=[m(±sm)]x +[b(±sb)]. Use Excel and do the calculations ‘by hand’. Check your answer using the linest function onExcel.b. Construct a graph showing the experimental data and the calculated straight line.c. An unknown (single sample) gave an observed absorbance of 0.735. Calculate the concentration ofphosphorus and estimate its uncertainty.Nickel bis-dimethylglyoximate complex was deposited with a weight of (4.869g) with the filter paper from the base medium from adding (10ml) of hot DMG to a salt of nickel chloride at weight (0.78g), find the percentage of nickel ion. Note that the weight of the filter paper (1.30g). At.Wt.: Ni= 58.69 g/mol, C= 12 g/mol, O=16 g/mol, H=1 g/mol, N=14 g/molWhat is the theory of colorimetric determination of iron in the tap water sample?
- Aluminium (III) reacts with the Chelating agent HL to give a complex AlL3 that is readily soluble in CHCl3. A spectrophotometric study shows that when a 1.77 x10-4 M aqueous solution of aluminium was extracted with CHCl3 containing 0.01M HL, the analytical concentration of aluminium at pH 4.5 in the two phases were 1.5 x 10-4 M [Al3+]upper) and 2.73 x10-5 M ([AlL3]lower) . What is the distribution coefficient at pH 4.8.Molar absorptivities of Nickel and Cobalt with 8-quinilinol are εCo = 3529 and εNi = 3228 at 365 nm, and εCo = 428.9 and εNi = 0 at 700 nm. calculate concentration of nickel and cobalt in solution that gave Abs=0.617 at 365nm and Abs=0.0235 at 700nm.The molar absorptivity for cobalt and nickel complexes with 2,3-quinoxalinedithiol are 3.64x104L/M-cm for Co at 510nm, 5.52x103L/M-cm and 1.24x103L/M-cm for Co at 656nm and 1.75x104L/M-cm for Ni. A 250mg soil sample that was collected near an industrial metal-processing plant is dissolved, and masking agent is added to avoid interference from other metals present. Color is developed by adding the complexing agent and the sample is diluted to 100.00ml. The absorbance at 510nm is 0.517 and at 656nm it is 0.405 in a 1.00cm cell. Calculate the weight percent of Co and Ni in the soil.