# what 99.7% acetic acid means? - (May/22/2007 )

i have this bottle of 99.7% acetic acid , nothing else is written (molarity, density...) ... what does that percentage mean? and what is the molarity of this solution

i want a 5000 ul of 0.05M of that solution ....

it is a very basic question but really getting me crazy.

louay

-abohollolo-

QUOTE (abohollolo @ May 22 2007, 11:46 AM)
i have this bottle of 99.7% acetic acid , nothing else is written (molarity, density...) ... what does that percentage mean? and what is the molarity of this solution

i want a 5000 ul of 0.05M of that solution ....

it is a very basic question but really getting me crazy.

louay

it may mean that at least 99.7 % of your solution will be acetic acid. other components may be water, formic acid and others; try to get a data sheet of quality from the company

molarity should be 60.05 g/mol

-The Bearer-

agree with the Bearer, at least try to know the volume

-strawberry-

is it impossible to calculate from the molecular weight

-T. reesei-

I guess you could weight it...

is it correct if i weight 60.05 g of the solution (which is the MW of acetic acid) and consider it 1 mole and calculate the volume which might be equal to 60 ml .
and then complete that 60 ml volume to 1000 ml by water so i have 1 mole in 1000 ml so 1 M acetic acid and then form that i can make 0.05 M

what do you think.

-abohollolo-

QUOTE (abohollolo @ May 23 2007, 04:29 AM)
is it correct if i weight 60.05 g of the solution (which is the MW of acetic acid) and consider it 1 mole and calculate the volume which might be equal to 60 ml .
and then complete that 60 ml volume to 1000 ml by water so i have 1 mole in 1000 ml so 1 M acetic acid and then form that i can make 0.05 M

what do you think.

I have found an equal acetic acid solution of 99.7 % in our lab saying that it has a density of 1.049 g/ml, so

57.42 ml = 60.05 g

take 57.42 ml aa
ad 1000 ml water
to get an 1 M solution of acetic acid from your stock (99.7 %)

-The Bearer-

Yeah, go by weight or by volume if compensating for specific gravity, as The Bearer said...

It says 99.7% because that's the purity. It should not be considered a "solution", just consider it "acetic acid".

It's 99.7% rather than 100% because it's hygroscopic (like all acids) so it absorbs water from the air.

-Zouden-