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50.0 mL of 0.10 M HNO2 (Ka=4.5E-4) is added to 25.0 mL of 0.25 M KNO2 solution. What is the pH of the final solution?
Draw an energy diagram for the enthalpy of solution of NaCl given that the lattice energy is 773 kJ/mol, the enthalpy of hydration is -769 kJ/mol with an enthalpy of solution equal to 4 kJ/mol.
Use Henderson-Hassalbach equation. The pKa of Tris-HCl is 8.1. After you have added 1 N HCl to adjust the pH of the Tris solution to 8.1, what is the ratio (in mmols) of Tris to Tris-HCl in the resulting buffer solution?
An aqueous solution of trichloroacetic acid, that is 2.00 percent by weight trichloroacetic acid, has a density of 1.0083 g/mL. A student determines that the freezing point of this solution is -0.382 oC.
Determine the Kelvin temperature required for 0.0470mol of gas to fill a balloon to 1.20L under 0.988atm pressure.
how many kilojoules and kilocalories of heat are required to raise 40.0 g of water from -12 degrees Celsius to 130 degrees Celsius?
How many milliliters of 0.100 M NaOH(aq) would be needed to completely neutralize 50.0 milliliters of 0.300 M HCl(aq)
Each was extracted with three 5-mL aliquots of CCl4 containing an excess of 8-hydroxyquinoline. The extracts were diluted to 25 mL and their fluorescence was measured. What is the concentration of the zinc in the unknown solution?
what is the formula for the ion formed when each of the following elements loses its valence electrons.
Calculate the amount of heat required to completely sublime 61.0 g of solid dry ice CO2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 {kJ}/{mol}.
Imagine that you have a 7.00 litre gas tank and a 3.00 litre gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch.
Calculate the delta H for the reaction in KJ/mol AgNO3, assuming that the combined solution has a mass of 100.00g and a specific heat of 4.18J/gc
Alpha helices are a type of secondary structure in proteins. what is the length of a 53-kDa single-stranded alpha-helical protein segment?
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