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[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
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[phpBB Debug] PHP Warning: in file [ROOT]/latexrender/class.latexrender.php on line 280: copy(64b8b63afcee08c3fe6f7d06a00bc9c0.png): failed to open stream: No such file or directory
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[phpBB Debug] PHP Warning: in file [ROOT]/latexrender/class.latexrender.php on line 237: fclose() expects parameter 1 to be resource, bool given
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forum.virtualchallengemeets.com • View topic - Regional Ksp Problem
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Regional Ksp Problem

PostPosted: Wed Apr 18, 2007 12:16 pm
by mathguy
OK, Number 34 on the regional test has me stumped. I got it right, but I'm not sure if my logic was correct or if I was just lucky. Can somebody walk me through it?

34. Solid AgNO3 is slowly added to a solution containint 0.0010 M each of NaCl and NaBr. What concentration of Br- would remain in solution when AgCl begins to precipitate? The solubility product constant for AgCl is 1.8*10^-10 and that of AgBr is 3.3*10^-13.

Correct answer is 1.8*10^-6

Thanks a lot!!!

Re: Regional Ksp Problem

PostPosted: Wed Apr 18, 2007 1:35 pm
by MisterC

PostPosted: Wed Apr 18, 2007 5:28 pm
by Kurt
And does anyone know how to do #39? That's the only one I skipped on the test (other than the faulty physics question, that is). I had no idea how to do it.

PostPosted: Wed Apr 18, 2007 5:52 pm
by bradp
I didn't take it in competition, but, after looking at the test, this is how my scores probably would have gone:

Biology: [unparseable or potentially dangerous latex formula]
Chemistry: [unparseable or potentially dangerous latex formula]
Physics: [unparseable or potentially dangerous latex formula]

PostPosted: Wed Apr 18, 2007 6:14 pm
by MisterC

PostPosted: Wed Apr 18, 2007 6:22 pm
by bradp
You're given two [unparseable or potentially dangerous latex formula] values at two different temperatures and asked to find the [unparseable or potentially dangerous latex formula] of the self-ionization of [unparseable or potentially dangerous latex formula]

Kw for the self-ionization of water is 1.13E-15 at 273 K and becomes 9.61E-14 at 333 K. Calculate [unparseable or potentially dangerous latex formula] for the self ionization of water.

PostPosted: Wed Apr 18, 2007 6:32 pm
by MisterC
You need two equations:

Delta G = Delta H -T Delta S

and dG = -RT ln(K)

so,

dH-TdS = -RTln(K)

and

ln(K) = -dH/R(1/T) + dS/R

That gets the equation into the form of y=mx+b

You can solve for dH given the two Kw and temps.

PostPosted: Thu Apr 19, 2007 12:39 am
by Kurt
Ah, I guess I didn't know the second equation. Thanks. :)

PostPosted: Thu Apr 19, 2007 4:02 pm
by bradp

PostPosted: Thu Apr 19, 2007 4:05 pm
by stupidityismygam
omg, bradp learned [unparseable or potentially dangerous latex formula]

WOOHOO

i am so proud of you, my little boy is growing up :)

PostPosted: Thu Apr 19, 2007 8:19 pm
by MisterC
That is cool. Where can I find how to LATEX??

PostPosted: Thu Apr 19, 2007 9:30 pm
by bradp

PostPosted: Thu Apr 19, 2007 9:57 pm
by MisterC
[unparseable or potentially dangerous latex formula]

Interesting!

PostPosted: Tue Jun 26, 2007 1:27 pm
by bradp
nevermiind