Question

The molecular equation for chormium (III) hydroxide includes ions that actually play no role in the chemical formation of the solid.
Which ion(s) is/are the spectator ions?

• A. $C{r}^{3+}$
• B. $N{a}^{+}$
• C. $NaCl$
• D. $O{H}^{-}$

Answer 1

The correct option is B $N{a}^{+}$

The ions that play no role in the chemical formation of the solid are spectator ions.

$CrC{l}_3+3NaOH\to Cr(OH{)}_3+3NaCl(aq)$

$\Rightarrow$ Here, $N{a}^{+}$ ions do not play any role. So, $N{a}^{+}$ is spectator ions.