If an aqueous solution contains 1.2 mM of total ions, and the solution was FeCl3 (aq), what is the concentration of the chloride ion. I got 0.9 M. Can anyone check?

The reactants are listed on the left side of a chemical equation, while the products are listed on the right. Both sides of a balanced chemical equation have the same number of atoms of each element and the same overall charge.

What is the concentration of the chloride ion? I got 0.9 M. Can anyone check?

Generally, the chemical equation for the question is mathematically given as

b) If the solution is [tex]$\mathrm{Fe}_{3}(a \omega)$[/tex]

[tex]\begin{aligned}\mathrm{FCl}_{3} & \rightarrow \mathrm{a}^{+3}+3 \mathrm{Cl}^{-} \\& 1 \mathrm{Fe}^{+3} \mathrm{~S} 3 \mathrm{al} \text { ions incota. } \\\Rightarrow\left[\mathrm{El}^{-}\right] &=\frac{3}{4} \mathrm{Cl}^{-}+4 \mathrm{Cl}^{-} \\therefore\left[\mathrm{Cl}^{-}\right] &=1.2 \mathrm{~mm} \times \frac{3}{4} \\&=0.9 \mathrm{~mm}\end{aligned}[/tex]

In conclusion, the concentration of the chloride ion. I got 0.9 M is

[CL^-]=0.9mm