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1. In Week 1 of the lab, you determined the percent Co by converting your product into a blue-violet colored Co complex and measuring the absorbance in the Spec 20 instrument. What is the formula of this blue-violet complex?
2. In Week 1 of this lab, you synthesized a cobalt(III) coordination complex containing ethylenediammine as a ligand. You then performed an analysis for percent cobalt using spectrophotometry. Suppose that you dissolved 0.152 g of your green cobalt complex in water, added NaOH to remove all the ligands, and cooked the compound to dryness to make Co2O3. Redissolving this solid in HCl yielded the blue-colored CoCl42- ion. This solution was added to a 250.0-mL volumetric flask, which was filled to the mark with distilled water. Then, 10.00 mL of this solution was pipetted into a 100.0-mL volumetric flask and ammonium thiocyanate was added to make the blue-purple colored Co(SCN)42- ion. The absorbance of Co(SCN)42- was determined by spectrophotometry to be 0.419 and the molar absorptivity of the complex was 1790 M-1cm-1 using a 1.10-cm cuvette. Calculate the percent cobalt in the complex.
3. Given the data in Problem #42, what is the identity of the unknown Co compound?
4. What is the product formed when blue [CoCl4]2- is diluted in water to make a pink solution?
5. Given the two data points below for the kinetics of aquation of the above product, calculate the activation barrier (Ea) for the aquation reaction in units of kJ/mol.
k (s-1) T ( °C)
3.27 x 10-4 38.0
2.20 x 10-3 54.2
Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.95 M B(aq) with 0.95 M HCl(aq).
A student dehydrated 10.0 g of 2-methyl-2-butanol with %50 sulfuric acid and obtained 6.50 g of products. Calculate the theoretical yield and the percent yield.
Copper has two isotopes: Cu-63 (abundance = 69.2%, mass = 62.930 amu) and Cu-65 (abundance = 30.8%, mass = 64.928 amu). Calculate the (average) atomic mass of copper.
one day you notice that the outside temperature increase by 16 degrees Fahrenheit between your early morning jog and your lunch at noon. what is the corresponding change in temperature in the Celsius and Kelvin scales?
Write the formulas for each of the following ions and compounds: (a) tetrahydroxozincate(ll) (b) pentaaquachlorochromium
A gas mixture composed of helium and argon has a density of 0.853g/L at a 745mmHg and 298K .What is the composition of the mixture by volume?
A sample of N2O3 contains 1.26 moles of nitrogen. Use the following atomic masses: N =14, O=16.
If we add more water to the vessel the pressure (remains the same, decreases, or increases)? Fully explain answer for credit
9.780 grams of gaseous mixture contains ethane ,C2H6 and propane ,C3H8. it needs 1.120mol of oxygen when complete combustion to form CO2 and H2O. Compute the mass percent of C2H6 in the original mixture.
What will happen to the equilibrium as OH- ions are added?
at 25 degrees C a saturated solution of a metal hydroxide has a pH of 9. What is the value of the solubility-product constant (Ksp) of M(OH)2 at 25 degrees C?
If 69. J of heat are applied to 20. g of aluminum, by how much will the temperature of the aluminum increase? (The specific heat capacity of Al (s) is 0.89 J/(g °C).)
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