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Thread: messed up question?

  1. #1 messed up question? 
    Moderator Moderator AlexP's Avatar
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    I don't post homework questions here to get answers. however, i'm posting this one because i think it's really messed up, and i'd like to know if i'm right, and its not really possible to answer, or if i'm misunderstanding it. please reply asap when you read this, if you have an answer

    What would be the pH of a solution with a hydroxide concentration [H+] of 10^-10 M? <how do i do superscript?>

    That's typed correctly (hydroxide and [H+] underlined for emphasis). Shouldn't it say either "hydronium concentration" or have [OH-]? Or am i just having a moment of stupidity?


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  3. #2  
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    Simple rule to remember....

    pH + pOH = 14

    Hope that helps!

    - - - -
    Edit:

    What a minute ... i just re-read your question there. I don't know what the heck is going on. I don't know. maybe my answer still applies


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  4. #3  
    Moderator Moderator AlexP's Avatar
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    yeah, i know that rule. but the question still doesn't make sense. thanks though, much appreciated.
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  5. #4  
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    Ph = log -10 [H+]
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  6. #5  
    Moderator Moderator AlexP's Avatar
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    I know how to find pH. My problem is that this question seems to be asking for hydroxide concentration and H+ concentration, but it's multiple choice, so there's only one correct answer, and each answer is just simply a pH.
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  7. #6  
    Forum Freshman César's Avatar
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    Probably the wording and punctuation of the question is not the best. If you have a solution of an hydroxide in water, a pH = 10 is consistent with it.
    I would tick that one.

    Best regards,

    César
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  8. #7  
    Moderator Moderator AlexP's Avatar
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    i pointed out that question to the teacher today and she said that it was incorrect and that she probably meant to ask for [H+], so that's all set. thanks to everyone who tried to help.
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