## Chemistry and Chemical Reactivity (9th Edition)

a) $BaCl_2(aq)+Na_2SO_4(aq)\rightarrow BaSO_4(s) + 2\ NaCl(aq)$ b) The barium sulfate particles form a suspension and the cloudy appearance is the Tyndall effect: the particles scatter visible light. c) Since it has a very low solubility, the barium sulfate particles start to precipitate.