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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.
In collisions with the walls of the container or with other molecules, energy is conserved. Collisions with the walls of the container or with other molecules are elastic. The amount of space occupied by a gas is much greater than the space occupi..
Describe the reactant and products of the chemical reaction. Was the reactant (potato chip) completely consumed? What evidence supports your answer?
if you have 370 ml of water at 25 degrees Celcius and 130mL of water at 95 degrees C. what is the final temperatue of the mixture?
Consider the following reaction, equilibrium concentrations, and equilibrium constant at a particular temperature. Determine the equilibrium concentration of NO2(g).
1.70 atm of I2 and 1.30 atm of Br2 are loaded into an evacuated container. The following reaction takes place with Kp = 117.6 Calculate the equilibrium partial pressure of bromine gas. No approximations can be made because the equilibrium constant..
The mixture is 20% benzene by volume. A densitometer gives the density of the mixed stream to be 1.1 g/mL. What are the mass fractions of all three species?
A 3 g sample of C8H16O is burned completely in excess oxygen to yield CO2(g) and H2O(l) at 25 C, releasing 117.83 kJ of energy. What is the enthalpy of formation of C8H16O?
A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared. Calculate the initial pH of this solution. The Ka for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places
What is the system? What is the surrounding? In what direction does the heat flow? Is the process endothermic or exothermic?
If 8.32 grams of methanol, CH3OH, are dissolved in 10.3 grams of water, what is the mole fraction of methanol in the solution?
Using the data given below, calculate the residence times of the solutes in seawater. The amount of water flowing from rivers to oceans = 3.74 x 10^19 g yr-1 , and the amount of water in oceans = 1.35 x 10^24. What is the residence times of these ..
Consider the malate dehydrogenase reaction from the citric acid cycle. Given the following concentrations, calculate the free energy change for this reaction at 37.0 °C (310 K). ?G°\' for the reaction is 29.7 kJ/mol.
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