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Why can ammonia serve as a portable source of hydrogen for welding?

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Difference in molecular structure between ammonia/amines and quaternary ammonium ions — ammonia Ammonia and amines have a slightly flattened trigonal pyramidal shape with a lone pair of electrons above the nitrogen. In quaternary ammonium ions, this area is occupied by a fourth substituent.

Ammonia serves as a convenient, portable source of hydrogen for welding because it can be easily decomposed to yield the gas. This process provides a practical way to supply atomic hydrogen for welding applications.1