J.R. S. answered 02/27/21
Ph.D. University Professor with 10+ years Tutoring Experience
This is an acid/base reaction. For most acid/base reactions, the products will be water (H2O) and a salt.
2 HMnO4(aq) + Mg(OH)2 ==> Mg(MnO4)2 + 2 H2O ... balanced equation
The salt that forms, Mg(MnO4)2 is called magnesium permanganate