5. You need to make 500.0 mL of a buffer with a pH of 2.20. You...
5. You need to make 500.0 mL of a buffer with a pH of 2.20. You
have the following substances to work with:
0.100 M NH3 Solid NaN3 Solid NaClO2
0.100 M HClO2 Solid NH4Cl Solid Na2SO3
0.100 M HN3 Solid NaHSO3
Ka for HClO2 = 1.1x10-2
Kb for NH3 = 1.8x10-5
Ka for HN3 = 1.9x10-5
Ka1 for H2SO3 = 1.7x10-2
Ka2 for H2SO3 = 6.4x10-8
(Assume that the addition of solid does not change the volume of
the solution it’s added to
a. Describe how you would make this buffer using the above
reagents. Give specific volumes and masses.
b. Would it require more strong acid or more strong base to exhaust
this buffer? Explain your answer
c. Imagine that immediately after making this buffer, you add 20.0
mL of 1.00 M NaOH to the buffer. What is the pH of the buffer after
this addition?
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