[ItalianChick0188]

If I have an aspirin tablet that weights 0.535 grams with a concentration of 0.000034 g/mL. I pipeted 5.00 mL of a diluted solution into a 10.00 mL flask.

What is the % of Aspirin ?

[ARGOS++]

Dear ItalianChick0188;

And what are your calculation, and the concentration and absorption of your reference?
Please describe your method more exact, otherwise no determination and proof is possible.

Good Luck!
                    ARGOS⁺⁺

[ItalianChick0188]

my transmittance was 51.0 % and my absorbance 0.30. The concentration of the 0.535 grams of aspirin is 0.000034 g/mL.

My equation from the graph I did is y= 10584x - 0.064
My R^2 value = 0.9845

[ARGOS++]

Dear ItalianChick0188;

The data of the graph looks quite good, but what are the used units for it?

And what means:

If I have an aspirin tablet that weights 0.535 grams with a concentration of 0.000034 g/mL. I pipeted 5.00 mL of a ?diluted? solution into a 10.00 mL flask.

Except your graph the data and method is in no way clear!

With clearly know data you can use Beer-Lambert Law.

Good Luck!
                    ARGOS⁺⁺

[ItalianChick0188]

I'm trying to find the % of Aspirin in the 0.535 gram sample.

[ARGOS++]

Dear ItalianChick0188;

That’s the only thing that is clear!

But without knowing your method and data exactly, there is no help possible!
So what are the Units for your "10584" ?? 

Good Luck!
                    ARGOS⁺⁺

[syd]

You made a graph with concentration on one end and absorbance on another using a known quantity, like pure aspirin, correct?  It should be pretty linear, Beer's law or something.

You need to use the slope of that graph to calculate the concentration of aspirin in your unknown sample.  Since you have the absorbance of it, this should be relatively easy.

[syd]

From that number you should be able to get the weight of the actual aspirin in the sample and compare it to the weight of your unknown sample to get a percentage of aspirin in it.

[ARGOS++]

Dear syd;

The problem is that we don’t know how ItalianChick0188 the concentration did, if in grams or in moles or in %, or what.

And we don’t know also exactly the preparation of his references and also not what a ?diluted? solution is meaning.

Good Luck!
                    ARGOS⁺⁺