Question

solubility of ionic compounds
classify each of the compounds as soluble or not soluble:
sodium nitrate
barium iodide
copper(ii) carbonate

Explanation:

Step1: Solubility of sodium nitrate

All nitrates are soluble. Sodium nitrate ($\ce{NaNO3}$) has nitrate ion ($\ce{NO3-}$). So, sodium nitrate is soluble.

Step2: Solubility of barium iodide

Most iodides are soluble. Barium iodide ($\ce{BaI2}$) has iodide ion ($\ce{I-}$). Barium is not in the list of cations that make iodide insoluble. So, barium iodide is soluble.

Step3: Solubility of copper(II) carbonate

Carbonates are generally insoluble except those of Group 1 (alkali metals) and ammonium. Copper(II) carbonate ($\ce{CuCO3}$) is not of Group 1 or ammonium. So, copper(II) carbonate is not soluble.

Answer:

sodium nitrate: soluble; barium iodide: soluble; copper(II) carbonate: not soluble