a. Cesium chloride, CsC1, and sulfuric acid, HSO4 O Rule 4: an exception to the rule for sulfates; CsCl(aq) + HSO4 (aq) CSSO4(s) + HCl(aq) There is no precipitate: both CsSO4 and HCl are soluble; CsCl(aq) + HSO4 (aq) no precipitate O Rule 4: an exception to the rule for sulfates; 2CsCl(aq) + HSO4 (aq) Cs2SO4(s) + 2HCl(aq) O Rule 4: an exception to the rule for sulfates; 2CsCl(aq) + HSO4 (aq) Cs2SO4 (aq) + 2HCl(aq)