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An aqueous solution is prepared to be 0.410 M in sodium acetylsalicylate and 0.273 M in...

An aqueous solution is prepared to be 0.410 M in sodium acetylsalicylate and 0.273 M in benzoic acid.

(1) Is this solution a buffer solution? _____

(2) What is the pH of this solution? pH =

(3) If 0.142 moles of perchloric acid are added to one liter of this solution, what is the pH of the resulting solution? pH =

Ka - acetylsalicylate acid = 3.0 × 10-4

Ka- Benzoic Acid = 6.3 × 10-5

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Homework Answers

Answer #1

1)yes it is a buffer solution. it contain sodium acetyl salicylate and benzoic acid which give acetyl salicylic acid and sodium benzoate. so sodium acetyl salicylate-acetyl salicylic acid made buffer and sodium benzoate- benzoic acid made another buffer. so its a double buffer system.

2) we know from henderson equation , pH = 14 - 1/2(pKa + log salt/acid) this is vaid for weak acid strong base buffer.

pH = 14 - (-log[3*10-4] + log [0.410/0.410]) = 14 - 3.52 = 10.48

pH = 14 - ( -log[6.3*10-5] + log 0.276/0.276 ) = 14 - 4.2 = 9.8

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