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What would be the pH of a solution obtained by mixing 5 ~g of acetic acid and 7.5 ~g of sodium acetate and making the volume equal to 500 ~mL ? ( K _ a =1.75 10⁻⁵, pK _ a =4.76 )

Options

  1. ApH =4.70
  2. BpH < 4.70
  3. CpH of solution will be equal to pH of acetic acid
  4. D4.76 < pH < 5.0

Correct answer

D. 4.76 < pH < 5.0

Step-by-step solution

aligned pH & = pK _a+ [ salt ] [ acid ] & =4.76+ 7.5 500 5 500 =4.7+ 1.5=4.87 aligned Hence correct answer is 4.76 < pH < 5.0

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