Checking purity of chemicals

Waverunner

Don't buy from me
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Hello everyone and thank you looking at my post.

I'm decided I'm going to start making all the chemicals I can for my up coming synthesis of amphetamine and 4mmc. It'll give me practice and some idea of what to expect.

Here's the list of what I'll be making

Benzaldehyde
Nitroethane
Glacial acetic acid
n-Butylamine think I'll have to buy this one
1-Phenyl-2-nitropropene (P2NP);
Glacial acetic acid (AcOH);
Sodium hydroxide (NaOH);
Mercury (II) nitrate
Sulphuric acid just going to distill it
methylamine hydrochloride which I'll convert to methylamine aq 40%
dicloromentane (methyl chloride )
Phenylacetylmalonate?
Diethyl ether
Ether
And a few more

But my question is purity.
Like for example I have contrentated sulfuric acid and I need say 88%. I need to dilute it. I first need to know the concentration of sulfuric acid to then dilute to desired concentration.

Can anyone provide me with some information to go about this. I'm currently looking into checking density but I'm sure there are other ways.

Thank you and have a wonderful day
 
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