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The saltpeter was originally extracted from compost piles and animal wastes .
Deposits found in India provided a source for this explosive substance for many years. During the 1850s tremendous quantities of sodium nitrate were discovered in Chile, and saltpeter was formed by reaction with potassium chloride, of which there was a plentiful supply:
NaNO3(aq) + KCL(aq) -----> KNO3(s) + NaCl(aq)
Chilean nitrate was not at first considered satisfactory for the manufacture of black powder because it too readily absorbed moisture. Lammot du Pont, an American industrialist, solved this problem and started making sodium nitrate powder in 1858...
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