Question

What is the concentration of chloride ions in a solution whose concentration is `6xx10^-3*mol*L^-1` with respect to `"calcium chloride"`?

Answer 1

`1.2xx10^-2` `mol*L^-1` in chloride ion.

Explanation:

You have quoted a solution of `CaCl_2` that is `6xx10^-3` `mol*L^-1`, and I assume this to be this concentration with respect to the compound itself (i.e. `[CaCl_2]` `=` `6.0xx10^(-3)` `mol*L^-1` this is typically understood!).

Because this a `CaCl_2` solution, for each `Ca^(2+)`, there are `2` equiv `Cl^-` ion. Chloride ion concentration is effectively doubled to give `1.2xx10^-2` `mol*L^-1`.