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Problem with chemistry/concentrations?

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find [H3O+] for a soft drink whose pH is 3.2??

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  1. [H+] is the same as [H30+] which is

    (log 3.2 ) * -1


  2. ph = -log (H3O+)

    so,

    3.2 = - log (H30+)

    H3O+ = 10^- 3.2 = 6.31* 10^-4  

  3. pH = -log[H+] or -log[H3O+]

    rearrange the formula to get the answer

  4. the pH is -log [H3O+]  so taking the antilog^- of 3.2  one gets 6.39 X 10^-4  the concentration of the H3O+ is 0.000639 M

  5. 10x 3.2 = 1584.9 molecules
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