Answer is: BaCO₃ (barium carbonate). barium carbonate is white powder with low solubility in water, but good solubility in acids (<span>with the exception of sulfuric acid), because it forms solunle salts and carbonic acid (decomposes on carbon(IV) oxide and water). For example if we add hydrochloric acid in barium carbonate: BaCO</span>₃(s) + 2HCl(aq) → BaCl₂(aq) + H₂CO₃(aq).
