* Calcium carbonate (CaCO₃): This is a common mineral found in rocks and shells. It contains calcium (Ca), carbon (C), and oxygen (O).
* Sodium bicarbonate (NaHCO₃): Also known as baking soda, this compound contains sodium (Na), hydrogen (H), carbon (C), and oxygen (O).
* Potassium nitrate (KNO₃): This is a common fertilizer and explosive component. It contains potassium (K), nitrogen (N), and oxygen (O).
* Aluminum sulfate (Al₂(SO₄)₃): This compound is used in water treatment and papermaking. It contains aluminum (Al), sulfur (S), and oxygen (O).
Key Point: To identify a ternary ionic compound (containing three elements), look for a compound with a metal cation (positive ion) combined with a polyatomic anion (negative ion) containing at least two elements.
