A solution containing 1 g of the complex CoNH36Cl3 was passed through a cation exchanger. The acidliberated was made up to one litre. Find out the strength of the acid solution  (At. wt., Co=58.9,Cl=35.5,N=14,H=1 )

A solution containing 1 g of the complex $\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]{\mathrm{Cl}}_{3}$ was passed through a cation exchanger. The acidliberated was made up to one litre. Find out the strength of the acid solution

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Solution:

Molar mass of complex $\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]{\mathrm{Cl}}_{3}=58.9+6\left[14+\left(3×1\right)\right]+3\left(35.5\right)=266.4\mathrm{g}{\mathrm{mol}}^{-}.$

When solution of above complex is passed through cation exchanger, $\mathrm{HCl}$ is produced according to the following reactions.

(From cation exchanger)  $3\mathrm{mol}$

are produced from  of the complex i.e.

$\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]{\mathrm{Cl}}_{3}\equiv 3\mathrm{HCl}$

266.4 g complex liberated

$1\mathrm{g}$ complex liberated $\mathrm{HCl}=\frac{109.5}{266.4}\mathrm{g}=0.411\mathrm{g}$

Hence one litre solution contain $\mathrm{HCl}=\mathbf{0}\mathbf{.}\mathbf{411}\mathrm{g}$

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