finding final pH

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samanthalee14adis1G
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

finding final pH

Postby samanthalee14adis1G » Wed Nov 30, 2016 2:49 am

When finding the ph, why do we subtract the pOH from 14 to find the pH?
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rachel_john
Posts: 20
Joined: Wed Sep 21, 2016 2:56 pm

Re: finding final pH

Postby rachel_john » Wed Nov 30, 2016 3:06 am

I think it's because pKw=pH+pOH and because we know pKw= 14, you just plug in 14 and use the equation 14=pH+pOH to find your missing p, which in your case is pH.
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Rachel Wile 2D
Posts: 49
Joined: Sat Jul 09, 2016 3:00 am

Re: finding final pH

Postby Rachel Wile 2D » Wed Nov 30, 2016 7:29 am

We do this because pOH+pH=14. So, if the the question is asking us to find the pH and we have found the pOH we can just subtract the number we have found (pOH) from 14 in order to find pH.
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