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Part B What is the pH after 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid. Express the pH numerically to three decimal places. • View Available Hint(s) ? pH = Submit Previous Answers Incorrect; Try Again; 3 attempts remaining Part C What is the pH after 0.195 mol of NaOH is added to the buffer from Part A? Assume no volume change on the addition of the base. Express the pH numerically to three decimal places.

Part B What is the pH after 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid. Express the pH numerically to three decimal places. • View Available Hint(s) ? pH = Submit Previous Answers Incorrect; Try Again; 3 attempts remaining Part C What is the pH after 0.195 mol of NaOH is added to the buffer from Part A? Assume no volume change on the addition of the base. Express the pH numerically to three decimal places.

Chemistry
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Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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I need help with part b and c for 5
I Review | Constants Periodic Table d and its Part B its conjugate ers resist of acid or base. eak acid (HA) resented as What is the pH after 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid. Express the pH numerically to three decimal places. A (aq) • View Available Hint(s) s principle. If acid sume the added se is added, the its concentration. e H* through the A. In both pH = constant. Previous Answers by using the on: Submit [A] og HA X Incorrect; Try Again; 3 attempts remaining Part C What is the pH after 0.195 mol of NaOH is added to the buffer from Part A? Assume no volume change on the addition of the base. Express the pH numerically to three decimal places. • View Available Hint(s) Πν ΑΣΦ 4:51 PM pH = 3/21/2021
Transcribed Image Text:I Review | Constants Periodic Table d and its Part B its conjugate ers resist of acid or base. eak acid (HA) resented as What is the pH after 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid. Express the pH numerically to three decimal places. A (aq) • View Available Hint(s) s principle. If acid sume the added se is added, the its concentration. e H* through the A. In both pH = constant. Previous Answers by using the on: Submit [A] og HA X Incorrect; Try Again; 3 attempts remaining Part C What is the pH after 0.195 mol of NaOH is added to the buffer from Part A? Assume no volume change on the addition of the base. Express the pH numerically to three decimal places. • View Available Hint(s) Πν ΑΣΦ 4:51 PM pH = 3/21/2021
When a solution contains a weak acid and its conjugate base or a weak base and its conjugate acid, it will be a buffer solution. Buffers resist change in pH following the addition of acid or base. A buffer solution prepared from a weak acid (HA) and its conjugate base (A ) is represented as Part A What is the pH of a buffer prepared by adding 0.809 mol of the weak acid HA to 0.305 mol of NaA in 2.00 L of solution? The dissociation.constant K, of HA is 5.66 x 10 -7 HA(aq) =H'(aq) + A (aq) Express the pH numerically to three decimal places. The buffer will follow Le Châtelier's principle. If acid is added, the reaction shifts to consume the added H, forming more HA. When base is added, the base will react with H, reducing its concentration. The reaction then shifts to replace H* through the dissociation of HA into Ht and A . In both instances, (H+] tends to remain constant. » View Available Hint(s) pH = 5.823 Previous Answers The pH of a buffer is calculated by using the Henderson-Hasselbalch equation: v Correct [A"] pH = pKa+log HAJ Correct answer is shown. Your answer 5.83 was either rounded differently or used a different number of significant figures than required for this part. Important: If you use this answer in later parts, use the full unrounded value in your calculations. Since both the acid and base exist in the same volume, we can skip the concentration calculations and use the number of moles in the Henderson-Hasselbalch equation to calculate the pH. The answer will be the same. Part B What is the pH after 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid. Express the pH numerically to three decimal places. > View Available Hint(s) 4:50 PM 3/21/2021 pe here to search Del End F10 PgUp Ins Home F9 F12 PrtScn F8 F1 DII F5 F6 F7 F2 F3 F4 FI 1. @ %23 24 & Backs 7 8 2 4
Transcribed Image Text:When a solution contains a weak acid and its conjugate base or a weak base and its conjugate acid, it will be a buffer solution. Buffers resist change in pH following the addition of acid or base. A buffer solution prepared from a weak acid (HA) and its conjugate base (A ) is represented as Part A What is the pH of a buffer prepared by adding 0.809 mol of the weak acid HA to 0.305 mol of NaA in 2.00 L of solution? The dissociation.constant K, of HA is 5.66 x 10 -7 HA(aq) =H'(aq) + A (aq) Express the pH numerically to three decimal places. The buffer will follow Le Châtelier's principle. If acid is added, the reaction shifts to consume the added H, forming more HA. When base is added, the base will react with H, reducing its concentration. The reaction then shifts to replace H* through the dissociation of HA into Ht and A . In both instances, (H+] tends to remain constant. » View Available Hint(s) pH = 5.823 Previous Answers The pH of a buffer is calculated by using the Henderson-Hasselbalch equation: v Correct [A"] pH = pKa+log HAJ Correct answer is shown. Your answer 5.83 was either rounded differently or used a different number of significant figures than required for this part. Important: If you use this answer in later parts, use the full unrounded value in your calculations. Since both the acid and base exist in the same volume, we can skip the concentration calculations and use the number of moles in the Henderson-Hasselbalch equation to calculate the pH. The answer will be the same. Part B What is the pH after 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid. Express the pH numerically to three decimal places. > View Available Hint(s) 4:50 PM 3/21/2021 pe here to search Del End F10 PgUp Ins Home F9 F12 PrtScn F8 F1 DII F5 F6 F7 F2 F3 F4 FI 1. @ %23 24 & Backs 7 8 2 4
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