Alternatively, sources of As3− react with protonic reagents to also produce this gas:::Zn3As2 + 6 H+ → 2 AsH3 + 3 Zn2+::Na3As + 3 HBr → AsH3 + 3 NaBr==Reactions==Our understanding of the chemical properties of AsH3 is well developed and can be anticipated based on an average of the behavior of PH3 and SbH3.
::4 AsCl3 + 3 NaBH4 → 4 AsH3 + 3 NaCl + 3 BCl3Kot so poročali leta 1775, Carl Scheele zniža arzenov(III) oksid s cinkom v prisotnosti s kislino.