# How do you predict the product of a reaction?

$\text{2K"(s)+"Mg(OH)"_2(aq)->"Mg"(s)+"KOH} \left(a q\right)$
${\text{Cl"_2(g)+"MgI"_2(aq)->"MgCl"_2(aq)+"I}}_{2} \left(s\right)$
3"CuCl"_2(aq)+2"Na"_3"PO"_4(aq)->6"NaCl"(aq)+"Cu"_3("PO"_4)_2(s)
${\text{BaCl"_2(aq)+"K"_2"SO"_4(aq)->2"KCl"(aq)+"Ba""SO}}_{4} \left(s\right)$