Question

Which of these best explains what happens when the ionic substance calcium chloride (CaCl2) dissolves in water?. . A. The oxygen atoms in the water molecules are attracted to the Ca2+ ions.. . B. The oxygen atoms in the water molecules are attracted to the Cl− ions.. . C. The hydrogen atoms in the water molecules are attracted to the Ca2+ ions.. . D. The oxygen atoms in the water molecules are attracted to the H+ ions..

Answer 1

The correct answer is letter A. When an ionic substance Calcium chloride is dissolved in the water, the oxygen atoms of the water molecules are attracted to the Calcium 2+ ions. Oxygen is an anion while Calcium is a cation.

Answer 2

Answer: Option (A) is the correct answer.

Explanation:

When ionic compound $CaCl_{2}$ dissolves in water then it dissociates into ions, that is, $Ca^{2+}$ ions and $Cl^{-}$ ions.

Since water is a polar solvent, so oxygen atoms being negatively charged will attract positively charged $Ca^{2+}$ ions.

Whereas hydrogen atom being positively charged will attract $Cl^{-}$ ion.

Hence, we can conclude that the oxygen atoms in the water molecules are attracted to the Ca2+ ions best explains what happens when the ionic substance calcium chloride (CaCl2) dissolves in water.