Someone please help me with some very basic math...

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BigToque

Lifer
Oct 10, 1999
11,700
0
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I've got a chemistry problem regarding equilibrium and doing ICE charts. I've been given Kc=6.10 and an initial concentration. I need to find x.

The math problem is this:

Kc = x^2 / (2-2x)^2

rearranged: sqrt(6.10) = x / 2-2x

So what I've been doing is multiplying both sides by (2-2x) so that I've got:

2.47(2-2x) = x

4.94 -4.94x = x

How the fuck do I solve for x? I don't know what it is, but I have completely lost my ability to manipulate equations and I'm ready to throw my calculator into the wall.

(On a side note, is there an algebra for dummies type book somewhere that I can try to relearn grade this grade7-12 math? I have so much trouble manipulating equations!)
 
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PieIsAwesome

Diamond Member
Feb 11, 2007
4,054
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0
I've got a chemistry problem regarding equilibrium and doing ICE charts. I've been given Kc=6.10 and an initial concentration. I need to find x.

The math problem is this:

Kc = x^2 / (2-2x)^2

rearranged: sqrt(6.10) = x / 2-2x

How the fuck do I solve for x? I don't know what it is, but I have completely lost my ability to manipulate equations and I'm ready to throw my calculator into the wall.

(On a side note, is there an algebra for dummies type book somewhere that I can try to relearn grade this grade7-12 math? I have so much trouble manipulating equations!)

I'm gonna call sqrt(6.10) "A."

Take (2-2x) to the left, distribute (A) so that it becomes 2A - 2Ax = x and then add 2Ax to both sides so that it becomes 2A = x + 2Ax

Right?

EDIT: After seeing your edit, all you have to do is add 4.94x to both sides, so that you get 4.94 = 5.94x, then divide both sides by 5.94 so that you get x = (4.94/5.94)
 
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BigToque

Lifer
Oct 10, 1999
11,700
0
76
thanks for the help guys. i can't believe i actually had trouble with this. hell, i did fairly well in stats, calculus, and linear algebra my first go in university like 9 years ago.

i had been staring at x = 4.94 - 4.94x for over an hour wondering what the hell i was supposed to do.
 
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