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c/coa·submitted 2 years ago by u/freya_baptista

help me understand water content, I have read the wiki twice

Discussionbranch of 6 comments

I have had 10 orders now and I keep a table, so here is the honest summary rather than a vibe. Material has been consistent. Communication has not. Shipping has varied by about 40 days on nominally the same lane, which matters more in summer than in February. The independent number came back 99.0% against a claimed…

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6 comments, started 2 years ago
u/soren_zamora42 points·2 years ago

The confident tone is doing a lot of work that the evidence is not.

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u/valeria_karlsen33 points·2 years ago

no "is this good?" without saying what the compound and claimed purity are

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[removed]31 points·2 years ago

[removed by moderator]

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u/aleksi_eriksen29 points·2 years ago·edited

Water content on the document? That affects your concentration math.

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u/elodie_yilmaz-4 points·2 years ago

purity and net content are two different numbers, same vial

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u/freya_baptista1 point·2 years ago

the batch number or it did not happen

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How to read a certificate of analysis and what it does and does not tell you. Area% versus mass%, identity versus quantity, water content, related substances, acetate counterions, and the difference between a vendor-supplied COA and an independent test on the vial you actually received.

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