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A rock sample weighing 1.0637 g (exact to 0.0001 g) was finely ground and the metals were extracted by dissolving in strong acid. The acidic solution was neutralized with base and made up to 250 mL in a volumetric flask. A 20-mL aliquot was treated with 10.00 mL of reducing agent and 10.00 mL buffer and diluted to 50 mL in a volumetric flask. A 20-mL aliquot of the resulting solution was introduced into a separatory funnel along with 10.00 mL of neocuproine solution, and the copper-neocuproine complex was extracted into 20 mL isoamyl alcohol. The absorbance of the alcohol extract measured in a 1.000-cm cell was 0.671. The absorbance of a blank solution prepared in the same manner was 0.025. The molar absorptivity of the copper complex is 7.90 x 103 L.mol?1.cm?1. Calculate the weight percent copper in the rock sample
An aqueous antifreeze solution is 48.5% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.062 g/cm3. Calculate the molality, molarity and mole fraction of ethylene glycol
Chemical Kinetics - Show that only the reactants of the slow step of a reaction are found in the rate law of the reaction - which of the two steps is slower and which substance (if any) is probably an unstable intermediate?
Calculate the molar concentration of H+ ion of a 1.86×10-1 M solution of the weak acid HClO (make an approximate calculation assuming that initial concentration is equal to the equilibrium
How much would an empty volumetric flask, (weighing 27.16 grams, has a volume of 100.4 cm3 ) weigh when filled with bromine, an element that has a density of 3.1028 g/cm3.
a gas sample in an open manometer system has a pressure of 530 mmHg . The mercury column has a height of 545 mm on the gas sample side and a height of 425 mm on the air pressure side. what is the value of the air pressure in mmHg?
What mass of rm NaOH is needed to precipitate the rm Cd^{2+} ions from 35.0 mL of 0.540 M rm Cd(NO_3)_2 solution?
A catalyst decreases the activation energy of a particular exothermic reaction by 59 kJ/mol, to 51 kJ/mol. Assuming that the mechanism has only one step, and that the products are 94 kJ lower in energy than the reactants
a sample of sodium reacts complete with 0.497kg of chlorine, forming 819g sodium chloride. what mass of sodium reacted?
What is the specific heat of a substance that it takes 192 Joules to raise the temperature of 45 grams by 6 degrees Celsius
sample of HCl solution reacts with excess Mg to produce 4.20 L of H2 gas at 745 mmHg pressure and 35.0 degrees C. What is the molartiy of the HCl solution?
If the initial concentration was [SO2CL2]=.230 M, what is the equilibrium concentration of all species present if Kc= 2.99*10^-7 SO2Cl2(g) SO2(g)+Cl2(g)
Show the stereochemistry of the products you would expect when (2S,3S)-2,3-epoxypentane undergoes acid catalyzed hydrolosis.
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