First slide

Werner's theory

Question

One mole a yellow octahedral chromium complex, ${COCl}_{3} . {xNH}_{3}$ reacts with excess ${AgNO}_{3}$ solution. Weight of precipitate formed is (Atomic weight of Ag = 108, Cl = 35.5)

Moderate

Solution

${CoCl}_{3} . 6 {NH}_{3}$ is yellow coloured
$[Co {({NH}_{3})}_{6}] {Cl}_{3} → {[Co {({NH}_{3})}_{6}]}^{+ 3} + 3 {Cl}^{-}$
$3 {Cl}^{-} + 3 {Ag}^{+} \overset{}{\to} 3 AgCl ↓$
$W_{AgCl} = 3 x 143.5 = 430.5 g$

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