A complex compound of Co^{3+} with molecular | vedclass

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(B) The central metal ion is $Co^{3+}$ and its coordination number is $6$. The molecular formula is $CoCl_3 \cdot yNH_3$. Since the complex gives $3$

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$1$

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(B) The central metal ion is $Co^{3+}$ and its coordination number is $6$. The molecular formula is $CoCl_3 \cdot yNH_3$. Since the complex gives $3$ ions in water,it must dissociate as $[CoCl(NH_3)_5]Cl_2 \rightleftharpoons [CoCl(NH_3)_5]^{2+} + 2Cl^-$. Here,the primary valency is satisfied by $3$ chloride ions ($1$ inside the coordination sphere and $2$ outside). The secondary valency is satisfied by $5$ $NH_3$ molecules and $1$ $Cl^-$ ion. Therefore,only $1$ $Cl^-$ ion satisfies both primary and secondary valencies.

$A$ complex compound of $Co^{3+}$ with molecular formula $CoCl_{x} \cdot yNH_3$ gives a total of $3$ ions when dissolved in water. How many $Cl^{-}$ ions satisfy both primary and secondary valencies in this complex?

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