Question

Question 1 (1 point)

12.0 mL of a 0.50 M Na₂CO₃ solution is added to a large test tube. Enough 0.50 M NaHCO₃ solution is added to the test tube to give a final volume of 30.0 mL. What is the pH of the resulting buffer solution? H₂CO₃ has K_a1 = 4.3×10^-7 and K_a2 = 5.6×10^-11.

Question 3 (1 point)

A buffer solution is made by adding 15.0 mL of a 0.50 M Na₂CO₃ solution to 15.0 mL of a 0.50 M NaHCO₃ solution in a test tube. 2.8 mL of a 1.0 M HCl solution is added to this buffer solution. What is the final pH of the solution in the test tube?

H₂CO₃ has K_a1 = 4.3×10^-7 and K_a2 = 5.6×10^-11.

Answer 1

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Question - 3