Table 2. Dependence of ammonia yield on amount of acid.

Equiv. H2SO4	[NH4]+ yield a
12	92%, 94%
11	87%
9	88%
6	95%
5	72%
4	74%
3	74%

^aYields determined by the indophenol method in ref. 25. No detectable amounts of hydrazine were formed.