A beaker with 135 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 mol L−1. A student adds 8.60 mL of a 0.380 mol L−1 HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760. Express your answer numerically to two decimal places. Use a minus ( − ) sign if the pH has decreased.
A beaker with 135 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 mol L−1. A student adds 8.60 mL of a 0.380 mol L−1 HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760. Express your answer numerically to two decimal places. Use a minus ( − ) sign if the pH has decreased.
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter17: Principles Of Chemical Reactivity: Other Aspects Of Aqueous Equilibria
Section: Chapter Questions
Problem 89GQ: A buffer solution is prepared by dissolving 1.50 g each of benzoic acid, C6H5CO2H, and sodium...
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A beaker with 135 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 mol L−1. A student adds 8.60 mL of a 0.380 mol L−1 HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760.
Express your answer numerically to two decimal places. Use a minus ( − ) sign if the pH has decreased.
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Step 1: Determine the pH change of the buffer solution from the given data:
VIEWStep 2: Calculation for moles ratio of each species in the buffer solution:
VIEWStep 3: Calculation for moles of each species before add any HCl:
VIEWStep 4: Calculation for pH after addition HCl and pH change :
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