Sciencemadness Discussion Board
Not logged in [Login - Register]
Go To Bottom

Printable Version  
Author: Subject: Glacial acetic acid dillution to 80%,from 99.9%
todo
Harmless
*




Posts: 1
Registered: 5-12-2017
Member Is Offline

Mood: No Mood

[*] posted on 5-12-2017 at 04:08
Glacial acetic acid dillution to 80%,from 99.9%


Hello everybody,i would like to now, how i can make soliution,1litre 80% acetic acid,from 99.9% glacial acetic acid?thank you
View user's profile View All Posts By User
gdflp
Super Moderator
Thread Moved
5-12-2017 at 04:37
Sulaiman
International Hazard
*****




Posts: 1998
Registered: 8-2-2015
Location: Behind You
Member Is Offline


[*] posted on 5-12-2017 at 05:21


First you should clarify what you mean by 80%,
(by molar, mass or volume ratio for example)

Assuming that you mean 80% by weight then you will require 200g water per 800g acetic acid
if by volume then,,
1 part water per four parts glacial acetic acid, by volume, teaspoon/cup/cc/ml/cu.inch/....

By volume can be trickier as sometimes the volume of a mixture of liquids is not the same as the sum of their individual volumes,
but ignoring this usually small error,
add 200ml water to 800ml 99.9% acid to make 1000ml 80% acid

Before you start, you could check the freezing point temperature to be sure that your glacial is actually 99.9%

https://en.wikipedia.org/wiki/Acetic_acid_(data_page)
https://en.wikipedia.org/wiki/Acetic_acid

P.S. I ignored the 0.1% because for most of us it is non-trivial to measure volume to 0.1% absolute accuracy,
usually digital weighing scales are linear even if not calibrated, so weight ratios can be quite accurate.

P.P.S. So far I have not needed to make up a solution to an accurate ratio,
usually it is more important to know the actual concentration,
e.g. In general, I would rather have for example 77.65 +/-0.01 % than 80.0 +/-0.1%
(in practice different components of a mixture will have different rates of evaporating into, or being absorbed from, the atmosphere, so maintaining a mixture at high precision is often difficult)

[Edited on 5-12-2017 by Sulaiman]




View user's profile View All Posts By User
Corrosive Joeseph
International Hazard
*****




Posts: 507
Registered: 17-5-2015
Location: Unknown
Member Is Offline

Mood: Cyclic

[*] posted on 5-12-2017 at 06:05


Quote: Originally posted by Sulaiman  

Before you start, you could check the freezing point temperature to be sure that your glacial is actually 99.9%


"Freezing Points of Acetic Acid solutions"
http://askavantor.force.com/articles/FAQ/Freezing-Points-of-...


/CJ




MSDS Addict and OTC Slut
View user's profile View All Posts By User
draculic acid69
Harmless
*




Posts: 24
Registered: 2-8-2018
Member Is Offline


[*] posted on 24-9-2018 at 19:16


U add water to the gaa.talk about spoonfeeding answers
View user's profile View All Posts By User
andy1988
Harmless
*




Posts: 18
Registered: 11-2-2018
Member Is Offline

Mood: No Mood

[*] posted on 24-9-2018 at 20:16


Quote: Originally posted by todo  
Hello everybody,i would like to now, how i can make soliution,1litre 80% acetic acid,from 99.9% glacial acetic acid?thank you

Other answers are great. Knowledge of the fractional freezing process may help you understand things.

[Edited on 25-9-2018 by andy1988]
View user's profile View All Posts By User
nimgoldman
Hazard to Others
***




Posts: 114
Registered: 11-6-2018
Member Is Offline


[*] posted on 25-9-2018 at 01:05


Mix 800 ml glacial acetic acid and 200 ml water.

For more precise dilution, look up the dilution equation.

v1 * c1 = v2 * c2

in your case:

1000 * 0.8 = x * 0.999

x = 800.80 ml

You're welcome.

[Edited on 25-9-2018 by nimgoldman]
View user's profile View All Posts By User

  Go To Top