Hello everybody,i would like to now, how i can make soliution,1litre 80% acetic acid,from 99.9% glacial acetic acid?thank you Sulaiman - 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%
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]Corrosive Joeseph - 5-12-2017 at 06:05
