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TLS Online TPP Program

#Question id: 383

Three buffers are made by combining a 1 M solution of acetic acid with a 1 M solution of sodium acetate in the ratios shown below

1 M acetic acid              

1 M sodium acetate  

Buffer 1: 10 mL

 90 mL

Buffer 2: 50 mL

50 mL

Buffer 3: 90 mL

10 mL

 Which of these statements is true of the resulting buffers?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. pH of buffer 1 < pH of buffer 2 < pH of buffer 3

  2. pH of buffer 1 = pH of buffer 2 = pH of buffer 3

  3. pH of buffer 1 > pH of buffer 2 > pH of buffer 3

  4. The problem cannot be solved without knowing the value of pKa.

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