Chemistry question :)
 

Didn't know where to put this so feel free to move it :)

Here's something to frazzle your brains

You are provided with a solution containing 50ppm chloride ions. How many mls of this should be taken and diluted to produce 100ml of a 2.5ppm solution?

Re: Chemistry question :)
 

5 ml ?

Re: Chemistry question :)
 

:rolleyes: The only mark I got in my chemistry exam was for spelling my name correctly so don't be looking to me :erm:

Re: Chemistry question :)
 

ummmm (swigs a beer)


TAKE 100 ml of the solution, dilute in half, then throw half away ??

Re: Chemistry question :)
 

20mls :rofl: wtf do I know???

Re: Chemistry question :)
 

I'd say 20 ml

Re: Chemistry question :)
 

How did you come to that conclusion?

Re: Chemistry question :)
 

You didn't tell us what volume of the original solution we had :D

Re: Chemistry question :)
 

Gut feeling is with pem, 5 mils, but something tells me it might be 5.263 or 4.762, but I haven't quite figured it out yet (ie, I may well be wrong).

To Ramrod, I think that may drop out of the equation...

Re: Chemistry question :)
 

How did you come to that conclusion?

Re: Chemistry question :)
 

Doesn't matter, taking 10ml for instance, out of 100ltrs of 50ppm solution will still contain the same number of ions as taking 10ml out fo 100000ltrs of a 50ppm solution :)

Re: Chemistry question :)
 

We are assuming that both the original solution and the dilutant have an equal number of molecules per mil aren't we?

Re: Chemistry question :)
 

:blush: :D

Re: Chemistry question :)
 

Right, I will try an explanation for the 5 mil answer then. Assuming 1 million parts per mililiter, you need add add 19 mils of solution (going by my above assumption) to get to 2.5 ppm. This makes 20, so multiply both by 5 to get to 100 total. So, 5 mils of the original

Re: Chemistry question :)
 

I concur