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The next 6 questions involve the calculation of concentrations of the molecular and ionic species in an aqueous solution that has an analytical composition of 0.260 M KH2PO4 + 0.160 M K2HPO4.NOTE: The Ka's for the three acidic protons of phosphoric acid H3PO4 are: 7.11 x 10-3, 6.32 x 10-8, and 4.5 x 10-13. It may be helpful to write out the three dissociation reactions along with their Ka's and pKa's before starting these problems.
What is the pH of this solution?What is the concentration of the molecular species H3PO4?What is the concentration of K+ in molarity?What is the concentration of OH-?What is the concentration of PO43- in molarity?What is [H2PO4-]?
Calculate the molar concentration of OH - ions in an 1.43 M solution of hypobromite ion, BrO- (Kb = 4.0 10-6).
A steel cylinder of oxygen has a volume of 20.0 L at 22degrees C at 35 atm. What is the volume at STP? How many mol of oxygen
What volume of 3.02 M HNO3 can be made by diluting 142 mL of concentrated nitric acid (16.0 M HNO3)?
3NaHCO3 + H3C6H5O7= 3CO2 + 3H2O + Na3C6H5O7 1g of sodium bicarbonate and 1g citric acid are allowed to react. Find the limiting reagent.
A solution is made by mixing 41.0 mL of ethanol, C2H6O, and 59.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C?
if 77.0 mL of .150 M HCl (aq) is needed to neutralize all the NH3(g) from a 2.25 gram sample of organic material, calculate the mass percentage of nitroge in the sample.
calculate the mass of a sample of gold that occupies 5.0 X 10^-3 cm3 if the density of gold is 19.3 g/cm
A 1 L flask is filled with 1.45 g of argon at 25 C}. A sample of ethane vapor is added to the same flask until the total pressure is 1.25 atm.what is the partial pressure of argon in the flask?
description of the mechanism of this reaction? tertiary carbanion, 2-methylpentoxonium ion, sp hybridized pentyne, vicinal dihydroxide, or hydroxide ion.
Calculate the molarity of a solution of glycerol made by dissolving 34.000 mL glycerol at 15 C in enough water to make 300.00 mL of solution.
Within this analogy, discuss how the shielding by core electrons is analogous to putting a frosted-glass lampshade between the lightbulb and your eyes, as shown in the illustration.
Using Henry's law, calculate the molar concentration of O2 in the surface water of a mountain lake saturated with air at 20 ^ C and an atmospheric pressure of 665 torr. The partial pressure of O2 is .21 atm.
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