Look at the graphical representation of a buffer solution. In this experiment, 0

Question

Look at the graphical representation of a buffer solution. In this experiment, 0.10 moles of HCl were added to 0.30 moles of NH3 to make 1.0 L of solution. Which of the following correctly lists the buffer capacity of this system? Choose one answer. a. Range B for strong bases and Range C for strong acids b. Range A for strong bases and Range C for strong acids c. Range D for strong acids and Range A for strong bases d. Range C for strong acids and Range D for strong bases Which of the following acid-base pairs would be best for preparing a buffer solution with a pH of 8.15? Choose one answer. a. pair #1 b. pair #2 c. pair #3 d. pair #4

Explanation / Answer

Answer C is correct, because HCl is a strong acid which change the pH of the buffer solution.

If we add 0.1 mol / 1 L HCl means = 0.1M than the pH of this HCl

pH = -log[H+]=-log 0.1 = 1

if decrease the pH of solution by +1 .

A good buffer needs the pKa of the acid to be within one pH unit of the solution hence the correct answer is 4. pKa = 9.39

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