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標題:
nitric acid
發問:
Why must nitric acid be contained in a brown bottle , not a colourless one ?
最佳解答:
Nitric acid is an unstable compound. It will decompose to give nitrogen dioxide, which dissolves in water to form a yellow solution. So, we have to keep it in a brown bottle to avoid it from sunlight, because UV light presented in sunlight will speed up the decomposition of nitric acid. (UV gives energy to undergo decomposition.) 4HNO3(aq) → 2H2O(l) + 4NO2(g) + O2(g)
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