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vera_ewing

  • one year ago

What is the concentration of a 25.0 mL HCl solution containing a phenolphthalein indicator that is titrated with 0.1 M NaOH if it requires 34.2 mL before the solution turns pink? A. 0.0578 M B. 0.137 M C. 1.37 M D. 0.274 M

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  1. vera_ewing
    • one year ago
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    @JoannaBlackwelder Is it B or C?

  2. JoannaBlackwelder
    • one year ago
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    This is a strong acid titrated with a strong base. Do you know what happens at the titration point?

  3. vera_ewing
    • one year ago
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    No @JoannaBlackwelder

  4. anonymous
    • one year ago
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    0.1M NaOH=X/l0.0342L NaOH X is moles solute of NaOH X= 0.0342mol NaOH NaOH+HCl>>NaCl+H2O 0.00342 moles NaOH x (1mol HCl /1mol NaOH)=0.00342 mol HCl 0.00342mol HCl/0.025L HCl=0.137M I think. There is a shorter way to do this, but some problem require this step, if its not balanced.

  5. vera_ewing
    • one year ago
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    Thank yo so much, @Shalante

  6. taramgrant0543664
    • one year ago
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    @Shalante that is right good job and there is no real way other than this to do it except doing everything together in one formula

  7. anonymous
    • one year ago
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    No problem!

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