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vera_ewing

  • one year ago

A solution has [OH-] = 3.5 × 10-6. Based on that, what must be true about this solution? A. It is a basic solution. B. It is an acidic solution. C. It is a strong acid. D. It is a strong base.

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  1. vera_ewing
    • one year ago
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    @Australopithecus It's a solution right?

  2. Australopithecus
    • one year ago
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    You can use, pOH = log[-OH] pH = log[+H] (note [H3O+] = [H+]) And 14 = pH + pOH pH scale here: https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcRItdnE1nXkLZef0p_sBk99e563UyVvPpltQusWPmBbI1cNELC-ZVkMazc

  3. Australopithecus
    • one year ago
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    http://www.edu.pe.ca/gulfshore/Archives/ACIDSBAS/phscale2.jpg sorry use this link instead other is just a thumbnail

  4. vera_ewing
    • one year ago
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    So it's a strong base?

  5. Australopithecus
    • one year ago
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    Note that the that is log base 10 not ln

  6. vera_ewing
    • one year ago
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    Ohh so strong acid?

  7. Australopithecus
    • one year ago
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    yeah http://www.wolframalpha.com/input/?i=x+%2B+%28-log%283.5*10^-6%29%29+%3D+14 where x is pH

  8. vera_ewing
    • one year ago
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    It was A.

  9. vera_ewing
    • one year ago
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    It is a basic solution. Calculate the pOH using pOH = -log [OH-] = -log (3.5 × 10-6) = 5.5. This corresponds to a pH of 8.5. Because it is greater than 7, it is basic.

  10. Australopithecus
    • one year ago
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    sorry wolfram alpha uses natural log by default

  11. Australopithecus
    • one year ago
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    I told you it was log base 10 though

  12. Australopithecus
    • one year ago
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    sorry for that

  13. vera_ewing
    • one year ago
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    Don't worry about it. I'm glad you helped.

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