Answer:
3M
Explanation:
Because HCl and NaCl do not react with each other, the final number of the Cl⁻ ions is equal to the sum of the ions of each starting reagent:
Cl⁻ moles from HCl ⇒0.100 L * 1 M = 0.1 moles Cl⁻
Cl⁻ moles from HCl ⇒0.100 L * 5 M = 0.5 moles Cl⁻
We add up the volumes from each solution:
And finally calculate the final molarity of Cl⁻ ions: