SrCl₂ is soluble salt to precipitate one cation while keeping the other cation in solution.
What is cation & anion?
Cations are ions that are polarized. Anions are the name for negatively charged ions. Ions are charged atoms or molecules. If one or more of an atom's electrons are removed, it will transform from a balanced atom together into positive charges cation. If an unbalanced atom gains one or more electrons, it will transform into a negatively charged anion.
Briefing:
Due to mercurous, we can dilute any solution containing chloride ions to use as a NaCl solution.
Hg₂²⁺ is made up of group I cations that precipitated as chloride Sr²⁺ is from group V .
Net ionic equation:
Hg₂²⁺ + 2 Cl⁻ → Hg₂Cl₂
while SrCl₂ is soluble salt.
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