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vera_ewing

  • one year ago

A weak acid with an initial pH of 3.2 was titrated with a strong base. 15 mL of 0.1 M NaOH was added to the acid to reach the equivalence point at a pH of 8.6. What would you expect the approximate pH of the analyte to be after the first 5 mL of 0.1 M NaOH was added? A. 5.1 B. 7.2 C. 3.4 D. 8.6

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  1. Photon336
    • one year ago
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    definitely not 8.6.. would be <8.6 for sure.

  2. cuanchi
    • one year ago
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    I will said between 3.2 and 8.6

  3. Photon336
    • one year ago
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    @cuanchi is there a formula for this, because we don't know anything about the pKa. i would guess it's either 5.1 or 7.2

  4. cuanchi
    • one year ago
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    I am trying to figure out

  5. Photon336
    • one year ago
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    pH = pKA so at that point half the acid is gone.

  6. cuanchi
    • one year ago
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    we can not calculate the Ka because we don't have the initial volume of the acid, neither the final volume after the titration. We can calculate the moles but not the concentrations

  7. cuanchi
    • one year ago
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    what is your logical thinking about the problem?

  8. cuanchi
    • one year ago
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    did you read the book?

  9. cuanchi
    • one year ago
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    why do you think is B?

  10. Photon336
    • one year ago
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    I'm curious to know how to get the answer for this

  11. cuanchi
    • one year ago
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    @vera_ewing did you find the correct answer yet?

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