A beaker with 1.00×102 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 8.70 mL of a 0.320 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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A beaker with 1.00×102 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 8.70 mL of a 0.320 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.
View Available Hint(s)
▸ Hint 1. How to approach the problem
▸ Hint 2. Determine the initial number of moles of conjugate acid
Hint 3. Complete previous hint(s)
▸ Hint 4. Determine the number of moles of hydrogen added
▸ Hint 5. Calculate the final quantity of conjugate base
▸ Hint 6. Calculate the final quantity of conjugate acid
Hint 7. Determine the new pH
ΜΕ ΑΣΦ
ApH = -0.80
?
nor
22
Transcribed Image Text:A beaker with 1.00×102 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 8.70 mL of a 0.320 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. View Available Hint(s) ▸ Hint 1. How to approach the problem ▸ Hint 2. Determine the initial number of moles of conjugate acid Hint 3. Complete previous hint(s) ▸ Hint 4. Determine the number of moles of hydrogen added ▸ Hint 5. Calculate the final quantity of conjugate base ▸ Hint 6. Calculate the final quantity of conjugate acid Hint 7. Determine the new pH ΜΕ ΑΣΦ ApH = -0.80 ? nor 22
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