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Any Mathmaticians Out There?
Started by: Dr. Leg Kick

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Dr. Leg Kick
Aesculapius

Registered: Jul 2003
Location: Los Angeles

Any Mathmaticians Out There?

It's actually a chemistry problem focusing on galvanic cells, and working with redox equations but I only need help on the last part with the math. Either the professor gave us the wrong answer or I'm doing something wrong.

Haven't taken Calculus in a while, can't remember steps. Do I inverse both sides? Any help would be appreciated.

0.711 = 0.679 - 0.0257/6 ln [(x)^2/(0.10)^3]

I'm not asking for answer, just how to get to it.

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Dec 2nd, 2009 05:55 AM

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King Kandy
Senior Member

Registered: Sep 2006
Location: United States

What are you trying to do, solve for x?

If that's the case, I think you'd subtract 0.679 from both sides, divide both sides by 0.0257/6, then put both sides as exponents of e, removing the natural log. Then it's easy to solve.

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Dec 2nd, 2009 06:02 AM

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Dr. Leg Kick
Aesculapius

Registered: Jul 2003
Location: Los Angeles

Sovling for x. Not sure if this is right though. The x exponent for e is what I'm having trouble with.

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Dec 2nd, 2009 06:10 AM

King Kandy
Senior Member

Registered: Sep 2006
Location: United States

e^ln(x)=x

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Dec 2nd, 2009 06:12 AM

Dr. Leg Kick
Aesculapius

Registered: Jul 2003
Location: Los Angeles

quote: (post)
Originally posted by King Kandy
e^ln(x)=x

I got that part, but it's this that I can't remember how to do.

e^(x)^2/(0.10)^3

edit: nevermind, i see what you're saying.

edit: Got the answer. I appreciate the help King. thumb up

Answer: 7.5 x 10^4

Which is the concentration I needed to find the Ksp for InF3.

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Last edited by Dr. Leg Kick on Dec 2nd, 2009 at 06:15 AM

Dec 2nd, 2009 06:13 AM

AthenasTrgrFngr
Don't wanna die...

Registered: Jun 2007
Location: No Russian

im not sure if its pathetic that i have no idea what youre talking about. no expression

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Dec 2nd, 2009 06:46 AM

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BackFire
Blood. It's nature's lube

Registered: Nov 2001
Location: Huntington Beach, CA

Moderator

Don't fret, I don't either.

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Dec 2nd, 2009 06:59 AM

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Dr. Leg Kick
Aesculapius

Registered: Jul 2003
Location: Los Angeles

quote: (post)
Originally posted by BackFire
Don't fret, I don't either.

Hope you're watching the Kings games man. Haven't had a season like this in a while. Was thinking about getting tickets after finals.

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Dec 2nd, 2009 07:16 AM

King Kandy
Senior Member

Registered: Sep 2006
Location: United States

Don't hesitate to ask any more questions. After implicit differentiation and related rates (ugh) this seemed easy. Man I can't wait for calculus to be over.

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Dec 2nd, 2009 07:39 AM

AsbestosFlaygon
The Original One

Registered: Jun 2008
Location: Hall of Origin

Man, i hate math

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Dec 2nd, 2009 08:15 AM

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BackFire
Blood. It's nature's lube

Registered: Nov 2001
Location: Huntington Beach, CA

Moderator

quote: (post)
Originally posted by Dr. Leg Kick
Hope you're watching the Kings games man. Haven't had a season like this in a while. Was thinking about getting tickets after finals.

Absolutely. Watched them beat the Ducks tonight. Quick made some amazing saves.

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Dec 2nd, 2009 08:21 AM

Bicnarok
From Ganymede

Registered: Jul 2003
Location: Cydonia, Mars

Re: Any Mathmaticians Out There?

quote: (post)
Originally posted by Dr. Leg Kick

0.711 = 0.679 - 0.0257/6 ln [(x)^2/(0.10)^3]

well if someone can tell me what a "n [(x)^ " is, and wtf this is all about I might be able to help and learn something as well smile

Dec 2nd, 2009 09:31 AM

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GCG
Red Bull

Registered: Jul 2004
Location:

why are you using ^ instead of * ? blink

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Dec 2nd, 2009 01:30 PM

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Dr. Leg Kick
Aesculapius

Registered: Jul 2003
Location: Los Angeles

quote: (post)
Originally posted by King Kandy
Don't hesitate to ask any more questions. After implicit differentiation and related rates (ugh) this seemed easy. Man I can't wait for calculus to be over.

Finished Calc II a year in a half ago. Barely got a B in the class. Very boring stuff.

quote: (post)
Originally posted by BackFire
Absolutely. Watched them beat the Ducks tonight. Quick made some amazing saves.

Ya, I never heard of Quick before this season. He's doing well. Also glad we have Smyth on the team.

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Dec 2nd, 2009 03:35 PM

Blinky
Android First Class

Registered: Aug 2008
Location: United States

How is that a Calculus problem? I see no differentiation or integration required. That looks like a college algebra problem.

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Dec 2nd, 2009 04:01 PM

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JacopeX
Restricted

Registered: May 2005
Location: Everywhere

Account Restricted

quote: (post)
Originally posted by Blinky
That looks like a college algebra problem.

Really?

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Dec 2nd, 2009 04:26 PM

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Blinky
Android First Class

Registered: Aug 2008
Location: United States

quote: (post)
Originally posted by JacopeX
Really?

Yeah really. Last time I had a problem that said "solve for X" it was probably in Pre-Calc, many years ago. I took 3 semesters of Calc, differential equations and Numerical Analysis - not once did I ever get a problem where I had to simply solve for X.

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Dec 2nd, 2009 04:34 PM

King Kandy
Senior Member

Registered: Sep 2006
Location: United States

That's true, this does not require anything more than algebra.

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Dec 2nd, 2009 04:43 PM

Dr. Leg Kick
Aesculapius

Registered: Jul 2003
Location: Los Angeles

quote: (post)
Originally posted by Blinky
How is that a Calculus problem? I see no differentiation or integration required. That looks like a college algebra problem.

I remember using the function tons in calculus, maybe that's why I thought it was a calc problem.

quote: (post)
Originally posted by King Kandy
That's true, this does not require anything more than algebra.

Again, thanks for the help.

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Dec 2nd, 2009 05:26 PM

Bardock42
Junior Member

Registered: Nov 2004
Location: With Cinderella and the 9 Dwarves

I see you solved this already, but for the future Wolfram Alpha can actually solve such things for you, and show you the steps in between.

http://www.wolframalpha.com/input/?...(x)^2/(0.10)^3]

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Dec 3rd, 2009 02:01 AM

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