Answer
(a) $HF (H_{2}O)→H^{+} (aq) + F^{-} (aq)$
(b) $Li_{2}SO_{4} (H_{2}O)→2Li{+} (aq) + SO_{4}^{-} (aq)$
Work Step by Step
(a) Hydrofluoric acid dissociates in water to form Hydrogen and Fluoride ions
(b) Lithium Sulfate dissociates in water to form lithium and sulfate ions