Question

solubility rules and electrolytes
possible points: 10
all sulfate compounds are soluble, except those containing ____ and ____
$nh_4^+$ $ba^{2+}$ $co^{2+}$ $cu^{2+}$ $k^+$ $ni^{2+}$ $pb^{2+}$ $ag^+$ $na^+$

Explanation:

Solubility rules state that sulfate compounds ($SO_4^{2-}$) are generally soluble in water, but form insoluble (or sparingly soluble) compounds with specific cations. From the given options, these cations are barium and lead(II).

Answer:

$\boldsymbol{Ba^{2+}}$ and $\boldsymbol{Pb^{2+}}$