Final answer:
In the reaction between cesium bromide and lead (II) nitrate, lead (II) bromide precipitates because it is insoluble in water according to the solubility rules, while cesium nitrate remains in solution.
Step-by-step explanation:
When solutions of cesium bromide and lead (II) nitrate are mixed, a double-replacement reaction occurs. The potential precipitates from this reaction are cesium nitrate and lead (II) bromide. According to the solubility rules table, cesium nitrate is soluble because compounds containing the nitrate ion and those with alkali metal ions are soluble without exceptions. However, most compounds with the bromide ion are soluble unless they are paired with lead (II). In this case, lead (II) bromide will form as a precipitate. The balanced net ionic reaction is:
Pb²+ (aq) + 2Br⁻ (aq) → PbBr₂ (s)