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To 1.00 L of a 0.100 M aquoeus solution of the weak base pyridine C5H5N is added 1.00 ml of 14.0 M NaOH. What fraction of the pyridine molecules in the resulting solution react with water to release hydroxide ions? (Kb C5H5N = 1.7 x 10^-9)
There is a titration of 25.00 mL. The equevalence point is reached after 18.50 mL of 0.171 M HCl has been added . What is the initial concentration of ammonia in the solution? what is the pH of the solution at the equivalence point
Find the volume of a molar solution and What volume of a 2.00 molar solution of sulfuric acid, H 2 SO 4 , is required to react with 250.0g of magnesium carbonate, MgCO 3 , according to the following equation?
Find the concentration of Pb2 in 0.0010 M KI saturated with PbI2. Include activity coefficients in your solubility-product expression. The Ksp of PbI2 is 9.8× 10-9. Hint from sapling below: Including activity coefficients, the solubility-product e..
The shielding of electrons gives rise to an effective nuclear charge,Zeff , which explains why boron is larger than oxygen. Estimate the approximate Zeff felt by a valence electron of boron and oxygen, respectively
You mix 50 ml of a weak monoprotic acid with 50 ml of NaOH solution in a coffee cup calorimeter. Both solutions and the calorimeter were initially at 22 C.
describe the unit cell for potassium flouride, copper(I) flouride, and cadmium flouride. How many atoms of each type are in each unit cell?
If ΔH = -60.0kJ and ΔS = -0.200kJ/K , the reaction is spontaneous below a certain temperature. Calculate that temperature. Express your answer numerically in kelvins.
Resonance Forms of the Enolate Ion of Acetophenone, In the stepwise trihalogenation process of a methyl group in acetophenone the methyl group in intitially deprotonated
One student measure the pH of the following three solution (weak base, conjugate acid and buffer). Using this data, please calculate the pKa and pKb (show calculation).
Calculate the amount of energy in kilojoules needed to change 135 of water ice at -10 degrees Celsius to steam at 125 degrees Celsius.
The following compounds undergo McLafferty rearrangement in the mass spectrometer. Predict the masses of the resulting charged fragments for each of the following compound.
Ammonium hydrogen sulfide decomposes on heating NH4HS(s) NH3(g) + H2S(g) If Kp for this reaction is 0.11 at 298 kelvins (with pressures in atmospheres)
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