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vera_ewing

  • one year ago

If 5.25 mL of an unknown HCl sample was titrated with 25.3 mL of a 0.00100 M solution of NaOH to its equivalence point, what is the initial concentration of the acid? A. 4.64 × 10^-3 M B. 4.82 × 10^-3 M C. 8.28 × 10^-4 M D. 2.08 × 10^-2 M

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  1. vera_ewing
    • one year ago
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    @JoannaBlackwelder I think it's A or B.

  2. JoannaBlackwelder
    • one year ago
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    What calcs did you use?

  3. vera_ewing
    • one year ago
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    I couldn't figure out which ones to use, so I asked for help and someone said either A or B. I'm not sure what he did.

  4. JoannaBlackwelder
    • one year ago
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    Ok, can you write out the acid-base reaction?

  5. vera_ewing
    • one year ago
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    Yeah I have it written down right now.

  6. JoannaBlackwelder
    • one year ago
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    Ok, what did you get the molar ratios of the acid and base to be?

  7. vera_ewing
    • one year ago
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    Oh wait it's B! Haha sorry :) thanks!

  8. JoannaBlackwelder
    • one year ago
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    Yep, good job. :-)

  9. cuanchi
    • one year ago
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    I dont think it is B I got a different value @vera_ewing

  10. vera_ewing
    • one year ago
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    It's B. I got it right :)

  11. cuanchi
    • one year ago
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    How come, I got D, how did you do?

  12. JoannaBlackwelder
    • one year ago
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    Find the moles of the base, and since the reaction is equimolar in the acid and base, the acid needs the same number of moles. @Cuanchi

  13. cuanchi
    • one year ago
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    I was using the formula V1M1=V2M2 and I got D its something wrong if I use the formula @vera_ewing?

  14. JoannaBlackwelder
    • one year ago
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    That is the same formula I used....not sure why we get different answers.

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