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MMLU-Pro / 4236 / The ionization constant of lactic acid at 25°C is 1.4 × 10^-4 . A buffer…

Problem

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question

The ionization constant of lactic acid at 25°C is 1.4 × 10^-4 . A buffer solution is prepared by adding 1.00 mole of lactic acid and 0.80 mole of sodium lactate to 1 kg of water. Assume that water is at unit activity and that the activity coefficient of each univalent ion is 0.65 throughout this problem. (a) Find the pH (in the activity sense) of this solution at 25°C. (b) Find the change in the pH of the solution resulting from the addition of 0.50 mole of sodium hydroxide to the quantity of solution containing 1 kg of water. (c) Find the change in pH resulting from the addition of 0.50 mole of sodium hydroxide to 1 kg of pure water at 25°C.

category

chemistry

options

  1. 3.47, 4.17, 13.412
  2. 4.17, 4.77, 14.212
  3. 3.87, 4.47, 13.812
  4. 2.87, 3.47, 12.912
  5. 3.07, 3.67, 13.312
  6. 4.57, 5.07, 14.512
  7. 3.57, 4.07, 13.512
  8. 4.07, 4.67, 14.112
  9. 3.67, 4.27, 13.712
  10. 2.57, 3.07, 12.512

src

stemez-PhysicalChemistry

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Source and history

upstream_id / Original problem ID
4236
task_id
d89b56ca-ebcf-5813-9155-d07d6d87379d
task_key
default--test--4236
task_revision_id
1
config / split
default / test

Official source

initial import