Please Help with all of the buffer questions 5. A solution contains 0.427 M HA (K a = 3.5610 -5 ) and 0.731 M NaA. What is the pH of this solution?

Please Help with all of the buffer questions

5.

A solution contains 0.427 M HA (Ka = 3.56⋅10-5) and 0.731 M NaA. 

What is the pH of this solution?

What is the pH of this solution after 0.166 mol of HCl are added to 1.00 L of this solution?

What is the pH of this solution after 0.332 mol of HCl are added to 1.00 L of this solution?

6.

A 2.00 L solution contains 0.541 M NH3 and 0.672 M NH4A. (The Kb of NH3 is 1.86⋅10-5).

What is the pH of this solution?

What is the pH of this solution after 0.225 mol of HCl are added to the solution?

What is the pH of this solution after 0.450 mol of HCl are added to the solution?

7.

Which of the following has the strongest buffer capacity?

  • 5.0 M HCl mixed with 5.0 M NH3
  • 2.5 M HA mixed with 5.0 M NaA
  • 5.0 M HA mixed with 5.0 M NaA
  • 0.5 M HA mixed with 0.5 M NaA
  • 5.0 M HA mixed with 5.0 M NH3

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