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A simple solvent extraction is used to determine the concentration of SDS (sodium dodecylsulphate) in river water. The student takes 5.0 mL of river water, adds 5.0 mL of reagent, and 5.0 mL of distilled water and extracts the sample into 20 mL of chloroform. The absorbance of the chloroform solution was 0.125. A second 5.0 mL aliquot of river water was taken, 5.0 mL of reagent, and 5.0 mL of 1.0 ppm SDS were mixed and extracted in 20 mL chloroform and the absorbance of the chloroform layer was found to be 0.286. What is the concentration of SDS?
A mass of mercury occupies 0.750 L. What volume would an equal mass of ethanol occupy? The density of mercury is > and the density of ethanol is 0.789 g/mL.
Calculate the number of theoretical plates N in the column of length L in 17 cycles. The observed resolution is 1.51.Now, calculate the plate height in the column in ?m.Estimate the resolution in 2 cycles
to form a molecule with an octahedral electron geometry what set of pure atomic orbitals must be mixed?
At some temperature, a chemist found the following equilibrium concentrations. [Fe3+] = 6.63 10-3 M, [SCN-] = 7.36 10-3 M, [FeSCN2+] = 4.34 10-2 M
insulin is a protein that is used by the body to regulate both carbohydrate and fat metabolism. A bottle contains 475 of insulin at a concentration of 30.0 . What is the total mass of insulin in the bottle?
a balloon has a volume of 1.20 L at 24 degrees C. the balloon is heated to 48 degrees C. calculate the new volume of the balloon.
In the lower troposphere, ozone is one of the components of photochemical smog. It is generated in air when nitrogen dioxide, formed by the oxidation of nitrogen monoxide from car exhaust, reacts by the following mechanism.
What is the percent ionization of a 0.171 M solution of this acid?
What is the molarity of a HCl solution that contains 6.13 g of HCl in 352 mL of solution?
Calculate the amount of energy (in Kj) necessary to convert 317g of liquid water from 0*c to water vapour at 172*c. The molar heat of vaporization of water is 40.79kj/mol.
Analysis of a 1.000 g of the oral hypoglycemic agent metformin yielded 0.3720 g of carbon, 0.0858 g of hydrogen, and 0.5422 g of nitrogen.
Calculate the volume change upon mixing sufficient ethanol with 8.85mol of water to give this concentration. The densities of water
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