1. According to Table 27.4, if you mix 45.0 mL of a 0.1 M NaH₂PO4 solution with 55.0 mL of a 0.1 M NazHPO4 solution, you will create a buffer with a pH of 6.9.¹ Using the Henderson-Hasselback equation, determine if this pH is based on the concentration ratio of the base/acid or the activity ratio of the base/acid. Show your work to prove your answer. Ionic Strength (µ) 0.001 0.005 0.01 0.05 0.1 0.2 Activity Coefficient for H₂PO4 Activity Coefficient for HPO4²- 0.964 0.867 0.928 0.740 0.902 0.660 0.820 0.445 0.775 0.335 0.750 0.290

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Chapter1: Chemical Foundations
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1. According to Table 27.4, if you mix 45.0 mL of a 0.1 M NaH₂PO4 solution with 55.0 mL of
a 0.1M Na2HPO4 solution, you will create a buffer with a pH of 6.9.¹ Using the
Henderson-Hasselback equation, determine if this pH is based on the concentration
ratio of the base/acid or the activity ratio of the base/acid. Show your work to prove
your answer.
Ionic Strength (μ)
0.001
0.005
0.01
0.05
0.1
0.2
Activity Coefficient for H₂PO4 Activity Coefficient for HPO4²-
0.964
0.867
0.928
0.740
0.902
0.660
0.820
0.445
0.775
0.335
0.750
0.290
2
Transcribed Image Text:1. According to Table 27.4, if you mix 45.0 mL of a 0.1 M NaH₂PO4 solution with 55.0 mL of a 0.1M Na2HPO4 solution, you will create a buffer with a pH of 6.9.¹ Using the Henderson-Hasselback equation, determine if this pH is based on the concentration ratio of the base/acid or the activity ratio of the base/acid. Show your work to prove your answer. Ionic Strength (μ) 0.001 0.005 0.01 0.05 0.1 0.2 Activity Coefficient for H₂PO4 Activity Coefficient for HPO4²- 0.964 0.867 0.928 0.740 0.902 0.660 0.820 0.445 0.775 0.335 0.750 0.290 2
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