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An unknown sample of Cu2+ gave an absorbance of 0.262 in AA analysis. Then 1.00 ml of solution containing 100.0 ppm Cu2+ ws mixed with 95.0 ml of unknown and diluted to 100 ml in a volumetric flask, The absorbance of the new solution was 0.500.
a. Write an expression for the final concentration of Cu2+ after dilution.b. Write the final concentration of added standardc. Find the concentration of Cu2+ in the unknown
The decomposition of ammonia is: 2 NH3(g) ?? N2(g) + 3 H2(g). If the partial pressure of ammonia is 1.6 × 10-3 atm and the partial pressures of N2 and H2 are each 0.25 atm at equilibrium, what is the value for Kc at 400°C for the forward reaction
The net charge of a polypeptide at a particular pH can be determined by considering the pKa value of each ionizable group in the protein. For a linear polypeptide composed of 10 amino acids, how many (alpha-carboxyl plus alpha-amino) groups must b..
The pH of 0.325g of aspirin (Molar mass 180.2) tablet in 0.5L water is 3.03, What is the pKa for weak, monoprotic acid aspirin? do not disregard x
Calculate the change in the mass of copper at the anode or cathode if the charge calculated above is passed through the cell described. Enter your answer as a positive quantity in mg. Mass change at the electrode = ? mg
In the electrolysis of aqueous NaClO3, how many liters of Cl2(g) (at STP) are generated by a current of 60.0 A for a period of 80.5 min? Use R = 0.0821 L-atm/mol-K for the gas constant and use F = 96,500 C/mol for Faraday's constant. Assume that 0..
What is the contribution to the internal energy from translations for an ideal monatomic gas confined to move on a surface?
Arrange the four compounds below in order of increasing volatility.
Tank full of water (H2O)is open at the top with the hole near the bottom the area of which is 0.25 m^2 and the cross section area of the tank =1 m^2 determine what is volumetric flow rate out of the hole.
What concentration of chloroacetic acid, ClCH2COOH, should be added to a 0.010 M ClCH2COONa solution to prepare a buffer of pH 4.00? Ka = 1.4 X 10-3
When one mole of solid NaOH is dissolved in 1L of solution, 44.5kj of heat are released. How much heat is released when 1.00g of NaOH is dissovled in 100.0mL of water?
5.00 mL of water sample was titrated for hardness with 4.15mL of 0.0200M EDTA. write the equastion for the reaction and calcualte the hardness of the water in ppm
Calculate the pH and the concentrations of all species present H3O+, F-, HF, Cl-, OH- in a solution that contains 0.10 M HF Ka = 3.5*10^-4 and 0.10 M HCl.
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