Question

Total how many ions are there in [Co(NH$_3$)$_5$Cl]Cl$_2$ solution?

• A. 2
• B. 3
• C. 4
• D. 5

Hint:

When calculating total ions in coordination compounds, check which groups are inside the coordination sphere (non-ionizable) and which are outside (ionizable).

Answer 1

The Correct Option is B

Step 1: Analyze the complex.
The given compound is \([Co(NH_3)_5Cl]Cl_2\).
- Inside the coordination sphere: \([Co(NH_3)_5Cl]^{2+}\).
- Outside the coordination sphere: 2 Cl$^-$ ions.

Step 2: Dissociation in aqueous solution.
\[ [Co(NH_3)_5Cl]Cl_2 \;\; \xrightarrow{H_2O} \;\; [Co(NH_3)_5Cl]^{2+} + 2Cl^- \]

Step 3: Count total ions.
- 1 cation: \([Co(NH_3)_5Cl]^{2+}\)
- 2 anions: Cl$^-$ ions
Total = \(1 + 2 = 3\) ions
Step 4: Final Answer.
Thus, the total number of ions in solution is 3.
\[ \boxed{3} \]