Abstract
IT is becoming customary, in the descriptions of histochemical methods, to express the concentration of solutions in terms not of percentage but of molarity. Thus, in one method, it is stated that a 0.004-M solution of lead nitrate should be used. Having eventually found a list of atomic weights and the formula of lead nitrate (it has, according to two textbooks, no water of crystallization) and then double checked my addition, I discovered that in 100 ml. of distilled water I should dissolve 107.7 mgm. of lead nitrate.
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LEACH, E. Expression of Concentrations of Solutions. Nature 187, 350 (1960). https://doi.org/10.1038/187350a0
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DOI: https://doi.org/10.1038/187350a0
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