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Bone was dissolved in hydrochloric acid, giving 45.0 mL of solution containing calcium chloride, CaCl2. To precipitate the calcium ion from the resulting solution, an excess of potassium oxalate was added. The precipitate of calcium oxalate, CaC2O4, weighed 1.437 g. What was the molarity of CaCl2 in the solution?
What mass (in grams) of solid Na2SO4 would need to be added to 250 grams of water to make an ideal solution with a boiling point of 103.6°C? (Kb for water is 0.512°C/m)
What is the important component in 1.0 M NaOH? What is the important component in 1.0 M HCl
Given the following two solutions: 0.200 M HC2H3O2(aq) with pKa = 4.76 ; 0.200M NaOH(aq) A mixture is made using 50.0 mL of the HC2H3O2 and 25.0 mL of the NaOH. What is its pH?
A circular colony of mold with diameter of 4.8 cm and density of 0.0023 g/cm2 what is the mass of object
Carbon disulfide is a foul-smelling solvent that dissolves sulfur and other nonpolar substances. It can be made by heating sulfur in an atmosphere of methane.
The equilibrium constant Kc for the formation of ammonia: N2(g) + 3H2(g) -> 2NH3(g), is 3.6 x 10^8 at 25 C. What is the concentration of ammonia, when the equilibrium concentrations [N2] = 5.4 x 10^-3 M, and [H2] = 2.1 x 10^-3
using vsepr molcule determine Electron Domain and Molcules for? CH3I ClF3 H2S SO3 SO4^-2 Nh4 NH2^- CO3^-2 ICI2
Treatment of 1.385 g of an unknown metal M with an excess of aqueous HCl evolved a gas that was found to have a volume of 382.6 mL at 20.0 C and 755 mm Hg pressure.
The iron (55.847 g/mol) in a 700.0 mL sample of a natural water was determined by precipitation of the cation as hydrated Fe2O3. The precipitate was filtered
Calculate the amount of heat required to completely sublime (turn from solid to gas) 25.0 g of solid dry ice (CO2) at its sublimation temperature. (the heat of sublimation is 32.3 kJ/mol)
On size-exclusion chromatogram you have three peaks (2.9, 3.5, and 4.8 min). Column dead volume is 12 mL, and flow rate 4 ml/min. Are your separation conditions fit for size-exclusion requirements? Explain why.
Using butane as your only carbon source, please propose a synthesis to make trans-2-ethyl-3-(1-oxoethyl)oxirane. any common reagent
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