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(D) $1$. The formula is $CoBr_2Cl \cdot 4NH_3$. $2$. Conductance measurements show $2$ ions per formula unit,which implies the complex dissociates as

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$[CoBr_2(NH_3)_4]Cl$

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(D) $1$. The formula is $CoBr_2Cl \cdot 4NH_3$. $2$. Conductance measurements show $2$ ions per formula unit,which implies the complex dissociates as $[Complex]^+ + [Counterion]^-$. $3$. Silver nitrate $(AgNO_3)$ gives an immediate precipitate of $AgCl$,meaning $Cl^-$ is outside the coordination sphere (as a counterion). $4$. It gives no $AgBr$ precipitate,meaning $Br^-$ ions are inside the coordination sphere. $5$. Therefore,the structure must be $[CoBr_2(NH_3)_4]Cl$. $6$. This complex dissociates as $[CoBr_2(NH_3)_4]^+ + Cl^-$,providing $2$ ions in solution.

$A$ complex has a composition corresponding to the formula $CoBr_2Cl \cdot 4NH_3$. What is the structural formula if conductance measurements show two ions per formula unit? Silver nitrate solution gives an immediate precipitate of $AgCl$ but no $AgBr$.

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