Question

What will be the molarity of $C{l}^{-}$ ions in an $\frac{M}{30}$ solution of $FeC{l}_3$?

• A. $\frac{M}{90}$
• B. $\frac{M}{30}$
• C. $\frac{M}{10}$
• D. $\frac{M}{5}$

Answer 1

The correct option is C $\frac{M}{10}$

Molarity of $C{l}^{-}=3\times$ (molarity of $FeC{l}_3)$
$=3\times \left(\frac{M}{30}\right)=\frac{M}{10}$