pH of a Weak Acid
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Uploader Comments (khanacademy)
Top Comments
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You are Wonderful Khan! Can't thank you enough for teaching all of us....You are truly appreciated!
2 years ago 30
All Comments (69)
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Could of used an ICE table... Simplifies EVERYTHING..
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Wooow, I can't believe I actually understand this -- finally!! I don't think my chem lecturer could have made it any more complicated... Khan Academy makes life so much easier.
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How do you exactly find the KaHF that he did at 6:30? Does he explain this in any of the videos?
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@imalazykid thanks i realized later on :D
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@shahruk10 That's because Sal has his pKa value wrong. pKa of HF is 3.15.
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how is a pH of 1.4 a weak acid ?? :S
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you have a strange accent...lol completellyyyy
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I got confused as hell, when you had the scientific notation, and had the x^2 stuff. You used an "x" in the scientific notation, I thought it was a variable, but it just meant multiply.
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Can't you just say that [H⁺]=[F⁻], and [H⁺][F⁻]=7*10⁻⁴*1.5 and thus [H⁺]=sqrt(7*10⁻⁴*1.5)=0.0324M and therefore the pH is -log(0.0324)=1.49 ? Or is that wrong since there may exist other H⁺ in the solution that came from water molecules colliding, rather than from the HF?
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its not dissassociate!! its dissociate:D
otherwise its amazing!
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just a small error. fluorine is F not Fl. but overall it was a very informative video. great job like always!
gamefaq 2 years ago 20
thanks for pointing that out. I added an annotation.
khanacademy 2 years ago 19