Picric acid is stored under a layer of water to prevent an explosion.
What is the right way to measure the amount of picric acid that taken out? It is wet and containing water.
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If accuracy is not essential, weigh a small amount drained for a fixed time but still wet, and then weigh again dried, to find the ratio of wet-to-dry weight (carefully disposing the dried, sensitized, explosive without destroying the scale or personnel).
Though this could give a rough idea of the actual dried weight, it would vary from batch to batch and with temperature.
Find some nice instruction:
As Picric Acid stored under layer of water, we could know it's concentration in the water. It should be enough for most of the applications.
Temperature ° C. grams picric acid/100 grams solution