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  • What is depression in freezing point of    if  <img alt="\mathrm{30 \m

What is depression in freezing point of  \mathrm{K C l}  if  \mathrm{30 \mathrm{ml}}  of an aqueous solution of  \mathrm{ \mathrm{KCl}}  was found to require \mathrm{ 25 \mathrm{ml}}  of  \mathrm{ 1 \mathrm{M} \mathrm{AgNO}_3}  solution when titrated using  \mathrm{ \mathrm{K}_2 \mathrm{CrO}_4}  as an indicator { Given  \mathrm{ \mathrm{Kf}: 2 \mathrm{kkg} \mathrm{mol}^{-1}}  )

Option: 1

3.32 


Option: 2

8.64 


Option: 3

 9.17 


Option: 4

 2.87


Answers (1)

best_answer

\mathrm{30 \times M =25 \times 1 }
\mathrm{M =\frac{25}{30} \\ }
\mathrm{M =0.83 }
\mathrm{\Delta T_f =(i)(K_ f)(\mathrm{m}) }
\mathrm{\Delta T_f =2 \times 2 \times 0.83 }
\mathrm{\Delta T_f =3.32 }.

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manish

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