I have some Hydrochloric acid that i would like to find the molarity of. The container says that the HCl is 31.45%. I am wondering if there is a way
to convert that into moles. and does the percentage mean that there are 31.45g of HCL in every 100ml of solution.chromium - 23-11-2007 at 09:49
No. This means that 100g of solution contains 31.45g HCl. Your HCl is very near to 10 mol/l or 36.5g/100ml.
Concentrations can be easily converted to different systems if you know specific gravity of solution.
[Edited on 23-11-2007 by chromium]chloric1 - 23-11-2007 at 14:37
Yes chromium is spot on with this. The bottle should give you a baume measurement. Like 20 degrees baume I believe. Go to a used book store and try
to find Langes Handbook of Chemistry or CRC Handbook of chemistry and Physics, especially the older ones! They will help you with your measurement
conversions. It is always good to find the specific gravity of an aqeous solution. Everything else can be determined from this.Squall - 23-11-2007 at 18:49
Chloric you are right the bottle does say 20 degree baume. but i have no idea what that means. And Thanks for the handbook idea.not_important - 23-11-2007 at 19:18
Quote:
Originally posted by Squall
Chloric you are right the bottle does say 20 degree baume. but i have no idea what that means. And Thanks for the handbook idea.
Thank You so much for the links.
Heres what I've come upwith.
According to the charts the specific gravity of a 20 degree baume solution is 1.6. So the solutiuon weighs 1.6g .
So next i multiply 1.6x1000 to get the amount of grams in a liter. Next i multiplied the resulting product by the percentage which is 31.45 so
1600x.3145=503
So the solution contains 503grams of HCl. next i multiply 503x31.45=16. So if i did my calculations correctly this tells me that my acid's
molarity is 16Moles.
I appreciate all of you help and would like to know if my calculations are done correctly. Thank you again
[Edited on 23-11-2007 by Squall]evil_lurker - 23-11-2007 at 20:17
Well, to calculate s.g. based on degrees baume, one would do the following.
145/(145-degrees baume)= s.g.
145/(145-20) =s.g of 1.16
1.16 x 1000 = 1,160g per 1000ml
1160 x .3145 = 364.82g
364.82 / 36.46 (molecular mass of HCl) = 10.00 moles per liter
Oh i see I made a careless mistake and wrote the specific gravity wrong 1.6 instead of 1.16. I need to watch out for stuff like that, but thank you
for pointing that out i appreciate all of your help.
