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Calculate the pH for each of the following points in the titration of 50.0 mL of a 1.5 M H3PO3(aq) with 1.5 M KOH(aq)
Calculate the pKa value of the acid and determine the number of moles of acid initially present. b) When the reaction is complete, what is the concentration ratio of conjugate base to acid
A 0.160-mole quantity of NiCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Ni2 ions at equilibrium. Assume the formation constant* of Ni(NH3)62 is 5.5 × 108.
Which weak acid would be best to use when preparing a buffer solution with a pH of 9.70? An acid with Ka = 3.2 × 10^-5 An acid with Ka = 4.0 × 10^-7 An acid with Ka = 1.3 × 10^-11
Write a balanced equation for the yeast using glucose to produce energy, etanol and carbon dioxide.
What will be the final temperature of the water in an insulated container as the result of passing 4.00g of steam [H2O(g)] at 100.0 Celsius degrees into 100.0g of water at 25.0 Celsius degrees
Calculate the difference in the chemical potential of sucrose at 0.01 M and at 0.0001 M concentrations.
What is the estimated value of the Faraday using the values for: a.) the electrode that gains silver? b.) the electrode that loses silver
Find an example of a natural product or drug that has been prepared using a Diels-Alder reaction. Show the complete synthesis of the drug.
Calculate delta H in kilojoules for the reaction, assuming that the heat capacity of the calorimeter is 776J/C , that the specific heat of the final solution is the same as that of water [(4.18 J/(g
The reaction and rate law for the gas-phase decomposition of dinitrogen pentaoxide are 2 N2O5(g) ---> 4 NO2(g) + O2(g), rate = k[N2O5]. Which of the following can be considered a valid mechanism(
The oxidation number of Cr changes during the reaction from ____ to ___. Because of this change, chromium is reduced/oxidized (circle one). The oxidation number of the alcoholic carbon changes from
Compare the IR spectra of cinnamyl alcohol and cinnamaldehyde. What is the major difference
Elimination competes with substitution reactions, especially at high temperature. If that's the case, why did I not see more elimination in my 2 reactions
I- is oxidized by MnO4- in basic solution to yield I2 and MnO2. The coefficient on H2O in the balanced redox reaction will be
Why does BrO2 have a free radical? explain the bonding that happen, and why it happens. Why does NO have a free radical? I know it's because there in one unpaired electron
A reaction has a standard free-energy change of -12.30 kJ mol-1 (-2.940 kcal mol-1). Calculate the equilibrium constant for the reaction at 25 °C.
The air in the ducts flows at 5.0 m/s, find the width of the ducts. (b) How big would the ducts need to be if the owner wanted the air to flow at 1.0 m/s
A fire truck attaches two fire hoses to a hydrant to fight a fire. Each hose has a diameter of 20 cm. The underground water pipe going to the hydrant has a diameter of 100 cm. In the underground pip
Write a balanced equation between citric acid (RCOOH) and sodium hydrogen carbonate
The confirmation test for Ag^+ is to add HNO3 to the [Ag(NH3)2] ^+ and see if a precipitate of AgCl forms. Where does the Cl ^ - come from. Why does adding HNO3 make AgCl precipitate
A swan can float on a lake with only 33% of its volume below the surface. What is the average density of the swan
The gravitational force exerted on a solid object is 5 N. When the object is suspended from a spring scale and submerged in water, the scale reads 3.5 N. What is the density of the object
The eardrum can rupture with as little as 35 kPa of pressure difference across it. What is the depth at which this pressure difference could occur
A tank with a flat bottom of area A and vertical sides is filled to a depth h with water. The top of the water is at atmospheric pressure. (a) What is the absolute pressure at the bottom of the tank