NY Regents Chemistry Exam June 2022
13 Based on Table F, which 10.-gram sample, when thoroughly mixed with 1 liter of water at room temperature, forms a heterogeneous mixture?
(1) ammonium chloride, NH4Cl
(2) potassium iodide, KI (3) silver bromide, AgBr (4) sodium nitrate, NaNO3
Explanation: Table F on the Reference Table is a solubility table. A compound that is soluble will dissolve in water forming homogeneous mixture. A compound that is insoluble will not be able to dissolve in water and a heterogeneous mixture will be formed. Therefore, we are looking for something that is insoluble. If we look at AgBr, we see that Br- is soluble UNLESS it is combined with Ag^+, Pb^2+, or Hg2^2+