In that study, they used a 15 millimole concentration. That sounded slim to me when I initially thought about it, but my numbers flip in the opposite way:
A mole of acetylsalicylic acid is 180.16g, a mole of water is 18.01 grams. Therefore, you need to dissolve 15/1000 x 180.16 = 2.7 grams of acetylsalicylic acid in 18.01 grams of water to make that concentration.
As a typical aspiring is 500 mg (1/2 gram), and a quart of water is roughly 950 g, you would need to dissolve 285 aspirin in a quart of water to achieve that concentration.
I ain't puttin' that on MY plants!
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