3. A solution containing 4.48 ppm KMNO4 has a transmittance of 0.576 in a 1.00 cm cell at 52 nm. If the transmittance of a known solution is 0.0735 calculate the concentration of the unknown KMNO4 solution in ppm.
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- 116.In a conductivity cell of a cell constant 0.003 cm³¹ concentration of 0.01 M solution of acetic acid, the resistance against ionic mobility is 20 ohm at 25 °C. the degree of dissociation of the acid is (where the molar conductance at infinite dilution = 390 x 104 2¹¹ m² mol¹ at 25° C) a) 0.015 b) 0.027 c) 0.038 d) 0.0474)The absorption of a 0.01 M complex solution in a 2.5 cm cell is measured as 0.5. Since the absorption of another solution in a 2 cm cell is 0.5, this What is the concentration of the solution?4. The %Mn in steel can also be determined spectrophotometrically by oxidizing the manganese to the intensely colored permanganate, MnO4-. Standard solutions of permanganate gave the following absorbances (in a 1 cm cell): ABSORBANCE CONC. OF MnO4 (g/mL) 0.210 1.05 x 10-5 0.315 1.61 x 10-5 0.429 2.21 x 10-5 0.599 2.98 x 10-5 0.801 4.04 x 10-5 The following samples of steel were thoroughly reacted to convert the manganese into permanganate and then diluted to 500.00 mL. WT. OF STEEL (g) ABSORBANCE 0.5886 0.611 0.3498 0.359 0.4555 0.482 Again using Excel, plot the calibration data and calculate the %Mn in the steel.
- A conductance cell was calibrated by filling it with a 0.02 mol L¹ solution of potassium chloride (K = 0.2768 nm) and measuring the resistance at 25° C, which was found to be 457.3. The cell was then filled with a calcium chloride solution containing 0.555 g of CaCl₂ per liter. the measured resistance was 1050 ). calculate( a-) the cell constant for the cell, and (b-) the conductivity of the CaCl₂ solution. C K = G; C 2.9268 C k توA (0.002M) Cu2+ solution gave an absorbance of 0.50 at 560 nm in a 1.0 cm cell. The molar absobitivity of solution is equel:0.35 μΜ Determine the molar absorptivity of has an absorbance of 0.42 at 610 nm in a 3.000-cm cell. 4.00×105 M¹ cm¯¹ -1 4.0×106 M¹ cm -1 4.0×105 M¹ cm -1 4.0×10³ M¹ cm -1 dichromate solution which
- A conductivity cell filled with a 0.01 M KCl solution was found to have a resistance of 189 ohms at 25oC. When filled with 0.01 M HCl solution, the cell gave a resistance of 64.8 ohms at the same temperature. At 25oC, the conductivity of 0.01 M KCl solution was 1.4088 x 10-3 S cm-1. Calculate (a) the cell constant and (b) the conductivity of the HCl solution. answer is [0.266; 4.105 x 10-3] please explain. thank you!The resistance of 0.01M acetic acid solution is found to be 222002, when measured in a cellhas two electrodes of area of cross section 3.85cm² placed 10.5cm apart. Calculateconductivity.A 2.78 ✕ 10−4 M solution of a compound has an absorbance of 0.417 at 520 nm in a 1.00 cm cell. The solvent's absorbance under the same conditions is 0.020. (a) What is the molar absorptivity of the unknown compound? M -1cm-1(b) What is the concentration of the compound in a solution, if the absorbance of the solution in a 1.00 cm cell at 520 nm is 0.391? M
- The following cell was found to have a potential of 0.2897 V:SCEIIMg2+(a = 3.32 * 10^-3M)membrane electrode for Mg^2+(a) When the solution of known magnesium activity was replaced with an unknown solution, the potentialwas found to be 0.2041 V. What was the pMg of this unknown solution?(b) Assuming an uncertainty of 60.002 V in the junction potential, what is the range of Mg21 activitieswithin which the true value might be expected?(c) What is the relative error in [Mg^2+] associated with the uncertainty in Ej?(d) Calculate the electrical conductivity of a 6.0 mm diameter cylindrical silicon specimen of 60 mm long in which a current of 0.5 A passes in an axial direction. A voltage of 12.5 V is measured across two probes that are separated by 40 mm. i. Compute the electrical conductivity of the specimen. C12334 ii. Compute the resistance over the entire 60 mm of the specimen using the data in (1).calcurate Aw The resistance of a conductivity cell containing 0.1M aqueous solution of KCI at room temperature was 24.96 2. Assume that conductivity water with specific conductance K= 7.5 x 10 S m¹ was used to prepare KCI solution whose K is 1.1639 S m. When the cell is filled with 0.01 M aqueous solution of acetic acid, the all resistance was 1982 2. Calculate Am of acetic acid.