Question: 100 mL of buffer solution that is 0.28M HA (K a = 4.2x10 -5 ) and 0.4M NaA is mixed with 28.9mL of 0.25M HCl.

100 mL of buffer solution that is 0.28M HA (Ka= 4.2x10-5) and 0.4M NaA is mixed with 28.9mL of 0.25M HCl. What is the pH of the resulting solution?

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