19) Which of the following would be a buffer solution? A) KCI/HCI B) KNO,/HNO C)

Question

19) Which of the following would be a buffer solution? A) KCI/HCI B) KNO,/HNO C) Na2SO4/H2SO4 D) NHj/NH4CI 20) Which of the following 0.40 M solutions has the highest pH? A) HCOOH B) CH:COOH C) HNO D) HCI IT) SOLVE THE FOLLOWING PROBLEMS. SHOW ALL YOUR CALCULATIONS. (10 POINTS EACH). 1) The pH of a 0.55 M aqueous solution of hypobromous acid, HBrO, at 25.0°C is 4.48. What is the value of Ka for HBrO? 2) The Ka of benzoic acid is 6.30 × 10-5, The pH of a buffer prepared by combining 500 mL of 1.00 M potassium benzoate and 50.0 mL of 1.00 M benzoic acid is .

Explanation / Answer

19) Mixture of a weak acid ( or base) and its salt is called as buffer solution.

In this question first three (A, B, C) options are with strong acids and their salts. None of these are buffer solutions.

Option (D) is answer since it has weak base ammonia (NH3) and its salt (NH4Cl)

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