When CaCl2 reacts with HCL there is no visible change. Name the ions that must be absent from calcium chloride?Please HELP...........'visble ions that must be absent from Cacl2...'
Calcium Chloride does not "react" with HCl. Calcium chloride is a water soluble ionic salt formed from one Ca+2 cation, and two Cl-1 anions. When CaCl2 is combined with water, the ions dissociate as they dissolve in the water.
Likewise, HCl, a covalently bonded gas, when dissolved in water, forms H+ and Cl- ions.
So when you combine CaCl2 and HCl in an aqueous solution, you end up with a mixture of Ca+2, H+, and Cl- ions in water.
None of the ions disappear, or go away. The compounds simply dissociate.