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In one experiment a student titrated 25.00 mL of an acidic solution containing Cu^2+ and Zn^2+ with 0.0123 M NaOH. The midpoints of the three pH jumps occurred at 15.35 mL, 19,77 mL, and 22.05 mL of added base. What was the concentration, in mol/L and mg/L, of Cu^2+ and Zn^2+ in the original solution? If the solution was prepared by dissolution of 0.654 g of brass in 250.00 mL solution, what the percentage of copper and zinc in the original sample of brass
Calculate the atom economy for each method for preparing 2,3-dibromo-3-phenylpropanioc acid.
Compute the hydroxide ion concentration in a NH 3 solution that is 0.091 M and 0.028 M NH 4 Cl. Kb of NH 3 is 1.8 x 10 -5 .
A compound is constituted by mass of 52.1% carbon and 13.1% hydrogen, the rest being oxygen. Given that a volume of 5.33 L of this gas has a mass of 11.5 g at 13 °C and 110 kPa, find the molecular formula for this compound.
sodium chloride dissolved in 225 g of water has a density of 1.98g/ml. Calculate the molarity of sodium chloride.
Sodium-24 is used to treat leukemia and has a half-life of 15 hours. A patient is injected with a salt solution containing sodium-24. What percentage of the 24Na remained after 48 hours
An industrial chemist studying bleaching and sterilizing prepares a hypochlorite buffer using 0.150 M HClO and 0.150 M NaClO. (Ka for HClO = 2.9x10^-8.)
It is estimated that more than 5 billion metric tons of CO2 is added to the atmosphere each year. Assume that CO2 is an Ideal gas at 25 oC and 1 atm.
A 10.80-mL sample of sulfuric acid from an automobile battery requires 35.18-mL of 1.62 M sodium hydroxide solution for complete neutralization. What is the molarity of the sulfuric acid? Sulfuric acid contains two acidic hydrogens.
Calculate the amount of heat required to completely sublime 78g of solid dry ice at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3kJ/mol .
The initial concentration of a reactant in the first order is .28M. The rate constant for the reaction is.75s^-1. What is the concentration of the reactant after 1.85s?
The Kp for the reaction below is 1.49 × 108 at 100.0 °C: CO (g) + Cl2 (g) ↔ COCl2 (g)
A gas cylinder that contains argon has an internal volume of 6.88 L. A pressure gauge attached to the cylinder reads 1810 psi
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