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When excess of silver nitrate solution is added to the aqueous solution containing 0.1 mole of CoCl_3 . xNH_3, if 28.7g of silver chloride precipitated, what is the value of x ? |
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Answer» Solution :Number of MOLES of AgCl precipitated `=(28.7)/(143.5)=0.2` mole. 0.1 mole of `CoCl_(3).xNH_(3)` gives 0.2 mole `AgCl`. One mole of `CoCl_(3).xNH_(3)` gives 2 moles of AgCI. Thus in the complex `CoCl_(3).xNH_(3)` two CHLORIDE ions SATISFY only primary valence. One chloride ion SATISFIES both secondary valence and primary valence. Since the secondary valence of `Co^(3+)` is six and one `Cl^(-)` is in coordination SPHERE, complex possesses five `NH_(3)` . Thus .x. value is five. |
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