SOLUTION CONTINUED HELP PLEASE

Questions and answers on how to convert things from one unit or system to another
Forum rules
Dear convert-me.com forum visitors,

Our forum has been available for many years. In September 2014 we decided to switch it to read-only mode. Month after month we saw less posts with questions and answers from real people and more spam posts. We were spending more and more resources cleaning the spam until there were less them 1 legitimate message per 100 spam posts. Then we decided it's time to stop.

All the posts in the forum will be available and searchable. We understand there are a lot of useful information and we aren't going to remove anything. As for the new questions, you can always ask them on convert-me.com FaceBook page

Thank you for being with us and sorry for any inconveniences this could caused.

SOLUTION CONTINUED HELP PLEASE

Postby NOR » Thu Jul 27, 2006 7:28 am

I need to make a solution that contains PAH (paraaminohippuric acid) at 25mmol/liter.
So as suggested I did like this
1. 25mmol/l divide by 1000=0.025mol/l
2. 0.025 mol/l x the MW of PAH which is 194.19g/mol =4.85475
does this mean i need to dissolve 4.85475 g of PAH in one liter to get the 25mmol/liter
However i have found out that i have little amounts of PAH
so I want to make just 100ml with a concentration of 25mmol/liter
So do i just do some ratio and proportion like:

4.85475 g PAH/1000ml =X g PAH/100ml =0.485475 g of PAH
Thus i just need to mix 0.485475 g of PAH then fill up to 100 ml
Is the concentration still 25mmol/ liter?
thanks
NOR
 
Posts: 18
Joined: Mon Jul 17, 2006 9:49 pm

Postby Guest » Thu Jul 27, 2006 6:42 pm

Yes, your ratio method is exactly right. You can use this method to make any amount, the substance and solvent just need to be in the right ratio.
Guest
 

additional question

Postby NOR » Thu Jul 27, 2006 6:49 pm

thank you so much
I have another if i were to make a a 1 liter solution (0.9% saline, already made) containing 1% PAH
is that just like getting 10 g of PAH and adding to 1000 ml of saline?thanks again in advance
NOR
 
Posts: 18
Joined: Mon Jul 17, 2006 9:49 pm


More info

  • List of all units you can convert online
  • Metric conversion
  • Convert grams to cups
  • Grams to milliliters
  • Imperial vs US Customary
  • History of measurement
  • Return to How to convert?

    Our Privacy Policy       Cooking Measures Converter       Metric conversions