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A- What is the pH of a buffer prepared by adding 0.809mol of the weak acid HA to 0.305mol of NaA in 2.00L of solution? The dissociation constant Ka of HA is 5.66 X 10^-7 B- What is the pH after 0.150mol of HCL is added to the buffer from Part A? Assume no volume change on the addition of the acid. C- What is the pH after 0.195mol of NaOH is added to the buffer from Part A? Assume no volume change on the addition of the base. Please give all answers to 3 decimal places.
Write the formula for each of the following compounds, being sure to use brackets to indicate the coordination sphere.
Given a column of air with a pressure of 1.57 x 10^5 Pa and an area of 1.12 m^2 and given that the acceleration due to gravity is 9.8 m/s^2, what is the mass of this column
Calculate the amount of solution (g or mL) that contains each of the following amounts of solute. Express the answer to two sig fiugres and include the appropriate units.
A 0.10-mol sample of a diprotic acid, H2A, is dissolved in 250 mL of water. The Ka1 of this acid is 1.0 x 10-5 and Ka2 is 1.0 x 10-10. Calculate the concentration of A2- in this solution.
Ascorbic acid (vitamin C) contains 40.92% carbon, 4.58% hydrogen, and 54.50% oxygen by mass. Assume a 100-g sample of ascorbic acid. How many moles of carbon, hydrogen, and oxygen are present in a 100-g sample of ascorbic acid
Calcium supplements commonly contain calcium ions in the form of calium carbonate (CaCO3). If one calcium supplement weights 600. mg, how many moles of calcium are contained in each pill
A cylinder containing a mixture of N2 and O2 is taken from the basement to the top of a 50-story building. Assuming that the temperature remains constant, which of the following properties of the gas change during the ascent
rom your initial observations, you suspect that the two beakers contain the same compound. Describe, in general terms, some experiments in a laboratory that you could do to help prove or disprove that the beakers contain the same compound.
What is an indicator and explain how it is used in titration. Enumerate the criteria in choosing the indicator for a specific titration.
A flask is filled with vapor by boiling a volatile unknown liquid in the flask. As it boils away, the vapor of the unknown pushes the air out of the flask through a tiny pinhole opening and eventually the flask is filled with an atmosphere compose..
How many moles of O2 are needed to burn 1.05 mol of C8H18
Consider the molecules ClF3O and BrF3O. (a) Would expect the lone pair on the central halogen to be axial or equatorial in these molecules? Explain
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