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Thread: pH calculation question

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    Senior Member Shuuya's Avatar
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    pH calculation question

    Question:

    The pH of an acid is given as 5.0 and it is also triprotic. Calculate the hydrogen ion concentration of the acid.

    -----------------------------------------------------------------------------------

    Just checking, the proticity of the acid shouldn't affect the concentration of the H3O+ ions right? (i.e. it's already taken into account when the pH was calculated?)
    Last edited by Shuuya; 5 Mar 2016 at 10:44 AM.
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    Quote Originally Posted by leehuan View Post

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    Einstein the idiot Bestintheworld's Avatar
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    Re: pH calculation question

    I think you have to first calculate the H+, i.e. [H+] = 10^-pH and then divide by 3 to get the concentration. Divide by 3 because its triprotic
    Last edited by Bestintheworld; 5 Mar 2016 at 11:03 AM.
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    Senior Member Shuuya's Avatar
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    Re: pH calculation question

    Quote Originally Posted by Bestintheworld View Post
    I think you have to first calculate the H+, i.e. [H+] = -10^pH and then divide by 3 to get the acid concentration. Divide by 3 because its triprotic
    Isn't the question just to find the H+ ion concentration though? (as opposed to finding the acid concentration)
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    Quote Originally Posted by leehuan View Post

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    Einstein the idiot Bestintheworld's Avatar
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    Re: pH calculation question

    Quote Originally Posted by Shuuya View Post
    Isn't the question just to find the H+ ion concentration though? (as opposed to finding the acid concentration)
    I edited my answer, it should have been like that above. I am not 100% sure though..
    Last edited by Bestintheworld; 5 Mar 2016 at 11:05 AM.
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    Senior Member Shuuya's Avatar
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    Re: pH calculation question

    Quote Originally Posted by Bestintheworld View Post
    I edited my answer, it should have been like that above. I am not 100% sure though..
    Ok, thanks

    I was pretty sure that you only had to do that to get the acid concentration though, not sure... :/
    Last edited by Shuuya; 5 Mar 2016 at 11:12 AM.
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    Quote Originally Posted by leehuan View Post

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    Re: pH calculation question

    Quote Originally Posted by Shuuya View Post
    I was pretty sure that you only had to do that to get the acid concentration though, not sure... :/
    That's what I thought too..
    Pretty sure you neglect the proticity of the acid, it shouldn't affect the concentration of the H3O+ ions

    But then again, not completely sure bc we just started this and completely missed the lesson
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    Ancient Orator leehuan's Avatar
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    Re: pH calculation question

    [H3O+]=10^-pH

    That's enough

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    Senior Member Shuuya's Avatar
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    Re: pH calculation question

    Quote Originally Posted by leehuan View Post
    [H3O+]=10^-pH

    That's enough
    Thought so
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    Quote Originally Posted by leehuan View Post

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    Re: pH calculation question


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