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  • Please help! The Ksp of Ag2CrO4, AgCl, AgBr and AgI are respectively, 1.1 x 10-12, 1.8 x 10-10, 5.0 x 10-13, 8.3 x 10-17. Which one of the following salts will precipitate last if AgNO3 solution is added to the solution containing equal moles of NaCl

The Ksp of Ag2CrO4, AgCl, AgBr and AgI are respectively, 1.1 x 10-12, 1.8 x 10-10, 5.0 x 10-13, 8.3 x 10-17. Which one of the following salts will precipitate last if AgNO3 solution is added to the solution containing equal moles of NaCl, NaBr, NaI and Na2CrO4 ?

  • Option 1)

    AgBr

  • Option 2)

    Ag2CrO4

  • Option 3)

    AgI

  • Option 4)

    AgCI

 

Answers (1)

best_answer

 As we discussed @9363 Let us calculate the solability of each salt

Ag_{2}C_{r}\rightarrow 2A_{g}^{+}+C_{r}O_{4}^{2}

1                     0             0

1-s                2s           s           

K_{sp}=\frac{\left ( 2s \right )^{2}s}{1-s}, s< < 1

=1.1\times 10^{-12}=4s^{3}

=s=6.5\times 10^{-5}

A_{g}C_{l}\rightarrow Ag^{+}+Cl^{-}

                s              s

1.8\times 10^{-10}=s^{2}

=s=1.34\times 10^{-5}

silmilarly s for A_{g}B_{r} and A_{g}  1 is 7.1\times 10^{-7} and 9\times 10^{-9} respectively since solubility of Ag_{2}C_{r}O_{4} is lighest, s_{a} it will perticipate lost.


Option 1)

AgBr

Incorrect option

Option 2)

Ag2CrO4

Correct option

Option 3)

AgI

Incorrect option

Option 4)

AgCI

Incorrect option

Posted by

prateek

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