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Homework Help: CHEM QUESTION - answer fast thx alot

  1. Jan 9, 2005 #1
    :::::: CHEM QUESTION - answer fast plz thx alot ::::::::

    Hi, this maybe a very stupid question but I have a test coming up tomorrow and i'm not sure of this thing here:

    Suppose you were given 1 M hydrochloric acid (I assume 1 M to mean a concentration of 1 mol/ L ) Calculate its [H3O]+ (square brackets mean concentratioN) and pH.

    ok what did was using pH = - log [H3O]+

    then u get -log (1) = 0

    there pH =0 , which makes sense since HCl is a very strong acid.

    and then apparently the [H3O]+ is 1 mol/L since it was given in the question.

    BUT THEN IF IT LIKE THIS, THEN WHAT KIND OF STUPID QUESTION IS THIS???? LOL!

    I doubt i did this right so can someone please confirm that i did it right or wrong? thanks.
     
  2. jcsd
  3. Jan 9, 2005 #2

    Pyrrhus

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    A strong acid diassociates completely in [itex] H_{3}O^{+} [/itex] or [itex] H^{+} [/itex] so yes the ph will be -log[concentration] and the amount of [itex] H_{3}O^{+} [/itex] or [itex] H^{+} [/itex] will be the HCL concentration.
     
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