1. AP Chem help

i've been stuck on this question for forever.

I don't want the answer to this but i have a solution of methylamine and i need the pOH of the solution.

When i get x is that is the [OH-]
Then when i put it into

-log(x) do i have pH or pOH.

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2. It has been a few months since I have done any of this, but I believe you have the OH- ions here. If you want to reverse the process then 2nd log or 10^x is what you would do with the value from the -log. To get the pH from a pOH, just subtract the pOH from 14.

Edit: I didn't quite realize what you were asking until I read it over a few times. If you are trying to get the pH from the [OH-], you would up 10^[OH-] and that would give you your pOH and subtract that from 14 for the pH. To find the pOH from the [H3O+], just do the same.

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3. Originally Posted by ChumLee
It has been a few months since I have done any of this, but I believe you have the OH- ions here. If you want to reverse the process then 2nd log or 10^x is what you would do with the value from the -log. To get the pH from a pOH, just subtract the pOH from 14.
so an example

CH3NH2 + H20 --> CH3NH3+ + OH-

Would that be pOH-

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4. In 10^x, x would be the concentration of Hydronium ions or Hydroxide ions, then you would get either the pH or pOH by pressing enter.

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5. Originally Posted by ChumLee
In 10^x, x would be the concentration of Hydronium ions or Hydroxide ions, then you would get either the pH or pOH by pressing enter.
yes i get that.

but in the case above would i get the pOH- or the pH

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6. Originally Posted by Kori
CH3NH2 + H20 --> CH3NH3+ + OH-
Originally Posted by Kori
yes i get that.

but in the case above would i get the pOH- or the pH
Well you can get both, but since the product contains a Hydroxide ion, I would start with getting the pOH. It all depends on the teacher if they want you to keep going to get the pH or not.

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7. Originally Posted by ChumLee
Well you can get both, but since the product contains a Hydroxide ion, I would start with getting the pOH. It all depends on the teacher if they want you to keep going to get the pH or not.
you are confusing me.

I need to find the pOH of the solution above.

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8. Yeahhhhh...I'm no help there. It's been a while since I've done this stuff. Sorry. :P

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9. Originally Posted by ChumLee
Yeahhhhh...I'm no help there. It's been a while since I've done this stuff. Sorry. :P
ok...

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10. Pm grey. He's a genius.

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