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- Describe why this reaction is significant: H3AsO4 (aq) + 4Zn (s) + 8H+ (aq)-> AsH3 (g) + 4Zn 2+ (aq) + 4H2O (l)In one sentence explain what is wrong with them, and rewrite them so that the coefficients are correct. 2 Mg(OH)2(s)+4HCl(aq)->2MgCl2(aq)+4H2O(l)Hi! I'd just like to confirm if I understood it correctly. :) K = [CS2] [H2]4 / [CH4] [H2S]2