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Aqueous solutions of phosphoric acid and sodium nitrite are combined, and the following equilibrium is established. H3PO4 (aq) + NO2- (aq) = H2PO4-(aq) + HNO2 (aq)
The equilibrium constant Kc for this reaction is greater than one. Based on this information, which of the following statements is correct?
a. Phosphoric acid is a weaker acid than nitrous acid.
b. Nitrous acid is a weaker acid than water.
c. The nitrite anion is a wesker base than the dihydrogen phosphate anion.
e. Phosphoric acid is a stronger acid than nitrous acid.
How much heat is required to vaporize 55.0 of acetone at its boiling point? The heat of vaporization of acetone at its boiling point is 29.1.
Calculate the concentrations of all species at equilibrium for the following case.
What is the pH at the point during a titration when 22 mL of 0.200 M HCl has been added to 33 mL of 0.0500 M NH3 solution? HCl is strong acid, Kb = 1.8 × 10-5 for NH3. Answer in units of pH
A certain quantity of helium gas is at a temperature of 27degrees C and a pressure of 1.00 atm. What will the new temperature be if its volume is doubled at the same time that its pressure is decreased to one half of its original value?
What is the molecular formula of the molecule that had an empiricial formula of C2 H4 S and a molar mass of 180.35% g/molecular.
Bauxite, the principle ore used in the production of aluminum cans, has a molecular formula of Al2O3•2H2O. (a) Determine the molar mass of bauxite. (b) How many grams of Al are in 0.58 moles of bauxite?
Phenolphthalein is one of the most common indicators. What are its colors in acidic and in basic solutions?
Suppose the pH of the water is 4.59 and that the concentration of iron(II) in the water is 7.99x 10-5 M, what is the potential of the corrosion reaction under the above conditions at 298 K?
For a reaction in which delta H= -360.1 kJ/mol and delta= - 90.0 J/K*mol, determine the temperature (in *C) below which the reaction is spontaneous.
unknown concentration of the weak base ammonia are standardized. 50.0 mL of the basic solution are titrated with 0.200 M HCl. The end point occurs after 38.8 mL of acid are added. What is the concentration of ammonia in the 2 L flask?
There are 2.2 mg of lead in exactly 500 g of a water sample. What would the concentration of lead be in parts per million? Round to the nearest tenth. Don't forget the units
a compound is 40% C, 6.7% H, and 53.3% O by mass. Assume that we have a 100 g sample of this compound. what are the subscripts in the empirical formula?
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