Buffers Practice Problems 1. Calculate the pH of a buffer solution that is 1.00 Min HC:H₂O₂ and 1.00 M in NaC₂H₂O₂- K₂ f

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Buffers Practice Problems 1 Calculate The Ph Of A Buffer Solution That Is 1 00 Min Hc H O And 1 00 M In Nac H O K F 1 (37.36 KiB) Viewed 38 times

Buffers Practice Problems 1. Calculate the pH of a buffer solution that is 1.00 Min HC:H₂O₂ and 1.00 M in NaC₂H₂O₂- K₂ for HC₂H₂O₂ is 1.8 × 10-³. 2. A 0.100 L buffer solution contains 0.100 mol HC₂H₂O₂ and 0.100 mol NaC₂H₂O₂. The value of K, for HC₂H5O₂ is 1.8 X 10¹. Because the initial amounts of acid and conjugate base are equal, the pH of the buffer is equal to pk-log(1.8 X 10)-4.74. Calculate the new pH after adding 0.020 mol of solid NaOH to the buffer. For comparison, calculate the pH after adding 0.020 mol of solid NaOH to 0.100 L of pure water. (Ignore any small changes in volume that might occur upon addition of the base.) 3. A 0.100 L buffer solution contains 0.100 mol HC₂H,O₂ and 0.100 mol NaC₂H₂O₂. The value of K. for HC₂H0₂ is 1.8 X 105. Because the initial amounts of acid and conjugate base are equal, the pH of the buffer is equal to pk-log(1.8 X 10)-4.74. Calculate the new pH after adding 0.020 mol of HCl to the buffer. For comparison, calculate the pH after adding 0.020 mol of HCl to 0.100 L of pure water. (Ignore any small changes in volume that might occur upon addition of the acid.) 4. Given a 50.0 ml. solution of 0.10 M acetic acid (Ka-1.8 x 10), how much sodium acetate must be added to prepare a buffer of pH 4.00? The formula for sodium acetate is C₂H₂O₂Na.