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Cobalt forms a colored complex when a solution of cobalt(II) ions is mixed with a solution of ammonium thiocyanate. The color of the tetraisothiocyanatocobaltate(II) ion solution is a deep blue. A student determined 605 nm to be its analytical wavelength. To obtain a standard curve for his unknown analysis, the student prepared a series of six standard solutions by adding a quantity of 0.0500 M Co(NO3)2 to a 50 mL volumetric flask that contained 10 mL of 1.0 M ammonium thiocyanate and 10 mL of DI water. Distilled water was added to make the total volume of each solution 50.00 mL. The percent transmittance of each solution was read, using a blank that contained all of the same components as the sample solutions except for the cobalt(II) solution.
How would I find the concentration of [Co(SCN)4]2- , for stock solutions of 1.0,2.0,5.0,7.0,9.0, and 10.0 mL solutions?
Assuming that none of the intermediates have appreciable concentrations, what are the values of C61206, O2, CO2, and H20, given that the overall rate is 1X10^-4 mol/L*S. Assume there is an excess of oxygen in the system.
Determine the dominant configuration of energy for this system by identifying energy configurations and calculating the corresponding weights. What is the probability of observing the dominant configuration
according to the following pKa values listed for a set of acids, which would lead to the strongest conjugate base?
The concentration of cholesterol, glucose and urea in the blood from a fasting individual are listed below in units of mg/100mL. Convert these concentrations into units of mM.
A solution of NaOH is standardized by titration with 0.100 N HCL. A total of 10.0 mL of NaOH requires 11.25 mL of HCl.
the osmotic pressure produced by the solution was 0.138 atm . What is the molar mass of the protein(g/mol)?
What is responsible for the pH behavior of the following solution. Include a chemical equation in your explanation. Show by calculation the pH you would expect from the solution.
What is the mass of the solid NH4Cl formed when 66.0 g of NH3 are mixed with an equal mass of HCl? What is the volume of the gas remaining, measured at 14.0°C and 752 mmHg
Outline the mechanism of the reaction of acetyl chloride with NaN3 to give acetyl azide. This reaction is known as Nucleophilic Acyl Substitution.
Calculate the vapor pressure of a solution containing 28.5g of glycerin (C3H8O3) in 125mL of water at 30.0 ?C. The vapor pressure of pure water at this temperature is 31.8 torr.
If I have 100.00 mL of 0.350 M latic acid already, how many grams of sodium lactate (molar mass = 112.06 g/mol) will I neeed to add to this solution to make the preceding buffer? Assume the volume does not change as the sodium lactate is added.
What is the minimum mass of ethylene glycol (ethane-1,2-diol, C2H6O2) that must be dissolved in 14.5 kg of water to prevent the solution from freezing at -22.0°C? (Assume ideal behaviour.)
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