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1. A student dissolves 0.01 mol of an unknown weak base in 100 ml water and titrates the solution with 0.1 M HNO3. After 40 ml of 0.1 M HNO3 was added, the pH of the resulting solution was 8.0. Calculate the Kb value for the weak base.
2. A 10 gram sample of the ionic compound NaA, where A is the anion of a weak acid was dissolved in enough water to make 100 ml of solution and was then titrated with 0.1 M HCL. After 500 ml HCL was added, the pH was 5. The experimenter found that 1 L of 0.1 M HCL was required to reach the stoichiometric point of the titration
A) what is the molar mass of NaA?B) Calculate the pH of the solution at the stoichiometric point of the titration.
3. The concentratioin of Ag in a solution saturated with Ag2C2O4(s) is 2.2*10^-4M. Calculate the Ksp for Ag2C2O4.
Hospital X-ray generators emit X rays with wavelength of about 15.0 nanometers (nm), where 1nm=10^9-m. What is the energy of a photon of the X rays
The vapor pressure of pure liquid A at 300K is 575torr and that of liquid B at 300K is 390torr. The molar volume of A is 0.0262L/mol and that of liquid B is 0.0306L/mol. Calculate the final partial pressures of A and B in the gas phase.
Calculate the pH of this solution. When 0.20 mol of H+ ions is added to the solution what is the pH (assuming volume change is negligible)
Propose a method to accurately measure the melting point of vegetable oil both before and after hydrogenation. Keep in mind that it will be too thick and greasy to insert in a capillary tube
5.00 mL of a 7.5x10^-3 M solution of HNO3 is diluted to 200. mL. What is the pH of the resulting solution
The heat capacity of the calorimeter is 2.21 kJ/Degrees Celsius. Using this information, determine the heat of combustion per mole of pentane. Could someone please explain clearly step by step on how to solve this problem.
What is the conjugate base of each of the above? d. Write the reaction for the conjugate base interacting with water. e. Write the Kb expressions for the reaction that involves the conjugate and calculate the actual value.
When 210.0mL of 0.350M K2CrO4(aq) are added to 210.0mL of 1.10×10^?2M AgNO3(aq), what percentage of the Ag^+ is left unprecipitated
8.0 moles of CO2 and 9.0 moles of H2O are places in a 5.0L vessel. When equilibrium is established, [C2H4]=0.45 M. Calculate Keq
the element neptunium possesses 93 electrons and weighs 237 amu. Calculate the contribution (in %) of its electrons to its total mass.
The element is so highly unstable that no observations of its properties have been possible. Based on its position in the periodic table, propose two different reasonable valence electron configurations for this element.
Write the balanced equation for the following reactions. Use only the following descriptions: neutralization, precipitation, gaseous, combustion, synthesis, single displacement or decomposition
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