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Jushiro
 Post subject: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 4:18 pm  
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What is the pH of a 0.043 M solution of ammonia at 25C?

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Azelma
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 4:19 pm  
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Jushiro wrote:
What is the pH of a 0.043 M solution of ammonia at 25C?


42.

Azelma

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Meowth
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 4:25 pm  
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I almost spit out my drink reading that.

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Aestu
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 6:15 pm  
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Jushiro wrote:
What is the pH of a 0.043 M solution of ammonia at 25C?


The Ka of ammonia is 5.75 log10 at 25C.

x^2 + 5.75 log10 x - .043*5.75 log10 = 0

Plugging in quadriatic equation gives irrational answer. What am I doing wrong?

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Jushiro
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 7:10 pm  
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I could be wrong but I tried 4 different ways and this is the most reasonable answer I've arrived at so far:

edit: oh yea... Jushiro has doctor writing.

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edit2: in most cases (including this one) you can pretend the -x doesn't exist because the reduction is lost to significant figures anyway.

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Aestu
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 7:46 pm  
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Pure ammonia has a pH of 11.6 so the answer seems somewhat rational.

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quadtard
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 7:51 pm  
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thats not practical!

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Tehra
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 8:00 pm  
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stay tuned for next year, when jushiro learns that calculus is used in physics.

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Tehra
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 8:00 pm  
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these double posts can only mean one thing.

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duh.

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Jushiro
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 8:05 pm  
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I haven't learned calculus yet.

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Usdk
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 9:27 pm  
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who gives a shit degrees

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Jushiro
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 9:29 pm  
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quadtard wrote:
thats not practical!


I know, I lied just like the math teacher did!

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Yuratuhl
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Mon Mar 28, 2011 10:54 pm  
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Tehra wrote:
stay tuned for next year, when jushiro learns that calculus is used in physics.


lol

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Fantastique
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Tue Mar 29, 2011 12:56 pm  
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what are you studying/majoring in?

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Jushiro
 Post subject: Re: First practical encounter with the quadratic equation
PostPosted: Tue Mar 29, 2011 2:15 pm  
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Stupid Schlemiel
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Chemical Engineering somethingerather

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