[zeshkani]

i just have a quick question, this might be so silly 

it says calculated the volume needed from the percents and densities for an FTIR experiment
how much ehtanol is needed to make a 20mL of a 0.5136[M] Ethanol solution whose percent purity is 100%

would this just be take the [M] x Volume(0.02L) = Moles x MW(46.07g/mol)/Density(0.7904g/mL) which will give me volume of ethanol needed then just dilute to 20mL right ??

[Borek]

20mL of a 0.5136[M] Ethanol solution whose percent purity is 100%

Something is wrong with the question - 0.5136M ethanol is not 100% pure.

Could be you are right.

[JGK]

20mL of a 0.5136[M] Ethanol solution whose percent purity is 100%

Something is wrong with the question - 0.5136M ethanol is not 100% pure.

Could be you are right.

I think the question should be more correctly phrased as follows:

"What volume of 100% pure ethanol is needed to make a 20mL of a 0.5136[M] Ethanol solution."

[zeshkani]

yeah your right, sorry for the confusing question.

so yeah we need to figure out how much 100% ethanol to use to make a 0.5136M Ethanol Solution
but is the way i described it right in my first post or em i totally off

[Borek]

OK, although you abused equal sign