Paper 2 · Stoichiometry and Mole Calculations
Write the ionic equation, including state symbols, for the reaction between barium ions and sulfate ions to form the white precipitate barium sulfate.
Model answer
Ba2+(aq) + SO4^2-(aq) -> BaSO4(s)
Also accepted: Ba2+ + SO42- -> BaSO4, Ba2+(aq) + SO42-(aq) -> BaSO4(s), Ba^2+(aq) + SO4^2-(aq) -> BaSO4(s), BaSO4
Explanation: Barium ions and sulfate ions combine to form insoluble barium sulfate: Ba2+(aq) + SO4^2-(aq) -> BaSO4(s).
Derived from ZIMSEC Chemistry 5071/2 Paper 2 Theory, November 2013, Q3
