any mathematicians here?

[Ormorof]

need abit of a hand

ok... i have -logKa=2.91

how do i work backwards and find out what Ka on its own is?

didnt realise chemistry was going to have maths this complicated

 

[dr_jo]

Hey.
So:

-logKa=2.91
logKa=-2.91 (multiply both sides by -1)

(then take ten to the power of each side)

Ka=10^-2.91=0.00123.....

Hope that helps.

(Assuming your log is to the base 10. If you're not sure, then it'll be 10)

 

[Wij]

Or natural ?

 

[dr_jo]

I suspect it'll be base 10. Most of the calculations we do in Biochemistry are log base 10, and this is a very similar case. But it could be base e I guess.

 

[Catsby]

Catsby thought the legend for Log base e was: Ln.

However, Catsby will use this oportunity to say Natural Log.

 

[leggy]

Catsby is correct. But Natural Log is so much more erotic.

 

[Wij]

By scat ?



(anagram)

 

[TdC]

I suspect he does.

 

[Tom]

I'm glad I paid no attention in advanced mathematics.

 

[Ormorof]

Hey.
So:

-logKa=2.91
logKa=-2.91 (multiply both sides by -1)

(then take ten to the power of each side)

Ka=10^-2.91=0.00123.....

Hope that helps.

(Assuming your log is to the base 10. If you're not sure, then it'll be 10)

thanks alot, ill assume the base log is 10, due in tommorow morning and was very last question on paper (only one i couldnt do)

thanks guys

 

[Paradroid]

I'm glad I paid no attention in advanced mathematics.

heh, you learn that in Higher Maths ffs! It's for kiddies!

 

[Tom]

I got as far as inverse hyperbolic functions, and had a hyberbolic function of the brain.

I really didn't see the point. Not to belittle those who like Maths, but it was a massive waste of time for me, just some stupid requirement to pass my BTEC.

 

[Catsby]

I got as far as inverse hyperbolic functions, and had a hyberbolic function of the brain.

I really didn't see the point. Not to belittle those who like Maths, but it was a massive waste of time for me, just some stupid requirement to pass my BTEC.

Catsby agrees, they should hand out BTECs to everyone.

 

[TdC]

ouch oO


I'll have you know that once I too could manage vastly complex sums! sadly, due to a combination of beer and "never ever using this ability in real life situations" I've forgotten most of it. I've also forgotten how to write it seems :/ my excuse is that I've been using computers and keyboards since I was 8 please sir, not the cane!!

 

[DaGaffer]

ouch oO


I'll have you know that once I too could manage vastly complex sums! sadly, due to a combination of beer and "never ever using this ability in real life situations" I've forgotten most of it. I've also forgotten how to write it seems :/ my excuse is that I've been using computers and keyboards since I was 8 please sir, not the cane!!

Yeah, what he said. Couldn't do a simultaneous linear equation to save my life now. Something to do with brackets rings a bell.

 

[TdC]

aye, I feel your pain still, I'm a bit miffed that the things I worked so hard on to get my head around are also the first to drain away.

 

[Brynn]

quite scary - gf's sister asked me to help her with her standard grade maths (bout 15 years old) stuff about pythagoras and stuff. I couldnt' do it....but i can fast fourier transform and do laplace and all kinds a crazy sheeet.

 

[leggy]

Being an electical/electronic engineer I use advanced maths frequently. Just not at the minute as I am looking for another job.

 

[Chilly]

Aha! calculating the pH of something if im not mistaken?

 

[~Yuckfou~]

I did this for "O" level, this was before GCSE exams existed, or whatever the latest equivalent is. So I was 15/16 at the time. As a result I can't remember any of it............ what was I saying?

 

[.Wilier.]

We did so much stuff studying for my degree that I dont use its rediculous.

One of lecturers actually said "Why remember what you can look up in a book/"

makes sense to me

........*forgets name*

*finds cheque book*

Aha