How many seconds will it take for Ca2+ and BR- to migrate 35.0 cm in a field of 4750 V/m? The mobilities are 6.12 x 10^-8 m^2/Vs for Ca2+ and 8.13 x 10^-8 m^2/Vs for Br-
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- Zinc is to be used as an internal standard for the polarographic analysis of thallium. A standard solution containing twice the concentration of zinc as Thallium has a diffusion current of 1.89 µA for Ti and 3.50 µA for Zn. A 10.0g alloy was dissolved in 500 mL, 25 mL of this solution was mixed with 25 mL of 1.0 x 10-3 M Zn 2+ solution. The diffusion currents of this final solution are 18.2µA for Tl+ and 14.5µA for Zn+. Calculate % Ti in the sample analysedChloroform is an internal standard in the determination of the pesticide DDT in a polarographic analysis in which each compound is reduced at an electrode surface. A mixture containing 0.500 mM chloroform and 0.800 mM DDT gave signals of 15.3 µA for chloroform and 10.1 µA for DDT. An unknown solution (10.00 mL) containing DDT was placed in a 100-ml volumetric flask and 10.2 µl of chloroform (MW = 119.39, density = 1.484 g/mL) were added. After dilution to the mark with solvent, polarographic signals of 29.4 and 8.7 HA were observed for the chloroform and DDT, respectively. Find the concentration of DDT in the unknown. Dichlorodiphenyltrichloroethane (DDT) ÇI CIThe answer is 0.372 ug/mL
- TLC was used to compare the solubility of two compounds A and B in a solvent system (acetic acid, methanol, H2O). The distances that solvent has moved in the silica gel TLC was 12 cm. and for the compounds were 2 and 8 cm respectively. (a) Calculate the Rf values and which compound is more soluble and which one is more polar. (b) What are the factors affecting the Rf value[3] The following Figure is the electrocapillary curves (A) and differential capacitance curves (B) for mercury in contact with 0.5 M Na,SO4 in the presence and absence of n-heptanol . 440- (A) (B) 420 Na,So. 400 Na, So, CHOH 360 Na so, 20 340- Na So, CH,OH 10 320 0.4 0.8 12 1.6 20 24 0.4 0.8 1.2 -EV ex NCE) 1.6 2.0 -EV e NCE (a) How do the curves in figure (A) relate to those in figure (B)? (b) What implications can be derived from the flat region in the electrocapillary curves in the presence of n-heptyl alcohol? (c) If we measure the electrocapillary curve of mercury in contact with 0.5 M Na,SO4 at higher temperature, what changes in the curve can be observed? Try to give explanation of these changes.What is the molar absorptivity coefficient? Question 13 options: 7.14 × 10–1 M–1 cm–1 1.40 × 103 M–1 cm–1 2.60 × 102 M–1 cm–1
- Find the standard deviation (if the mass of KHP in three experimental solutions are 0.467,0.48, and 0.48 and the volume of NaOH IN THE exp are 22,29,24 respectively in order to the masses of KHP ) the average molarity of NaOH in each experiment = 5.30x 10^-4 + 4.137x10^-4 + 5.0x10^-4 divided by 3 = 4.81x10^-4 ).Consider a 22.0 cm long column with a plate height of 0.0125 mm, a flow rate of 1.0 mL/min, and a Vm =1.2 mL (peak shapes are all symmetric). What is the solute retention time, retention volume, and peak width at half height when k’ = 7.2?What is the value of [S] with v = 0.5Vmax?
- The absorbance of an iron (III) thiocyanate, Fe(SCN)3 (MM= 230.09 g/mol), solution containing 0.00500 mg/mL is reported as 0.4900 at 540 nm. Calculate the specific absorptivity, including units, of iron (III) thyocyanate on the assumption that a 1.00 cm cuvette is used.A sample of water from a river was analyzed by titrating a 125 mL aliquot with 0.0210 M EDTA, consuming 22.52 mL. Express the hardness of the water in ppm of CaCO3.To determine the molar concentration of a metal ion in a solution of unknown concentration, a student fırst made five standard solutions that contain the metal ion of interest and measured the absorbance of each solution in a spectrophotometer at its Amax- A calibration curve was obtained that had an equation of y = 5.747 x + 0.013 Next, the student pipetted 15.0 mL of the initial solution of unknown concentration into a 100.0 mL volumetric flask, and filled the flask with deionized water to the line. The absorbance of this final diluted solution was found to be A = 0.226 at Amax. The color of the original and diluted solution was blue. What is the molarity of the original solution, as well as an approximate Amax for this metal ion? 2max = 599 nm and concentration is 0.247 M Amax 457 nm and concentration is 0.247 M %3D 2 max = 457 nm and concentration is 0.0371 M 1 max 599 nm and concentration is 0.0371 M Amax = 599 nm and concentration is 0.00557 M