MCQ
Solubility of $Ba{F_2}$ in a solution $Ba{(N{O_3})_2}$ will be represents by the concentration term
  • A
    $[B{a^{ + 2}}]$
  • B
    $[{F^ - }]$
  • $\frac{1}{2}[{F^ - }]$
  • D
    $2\,[NO_3^ - ]$

Answer

Correct option: C.
$\frac{1}{2}[{F^ - }]$
c
Let s be the solubility of $BaF _2$ in $BaNO _3$ solution.

The expression for the solubility product is given by,

$K _{ sp }=\left[ Ba ^{2+}\right]\left[ F ^{-}\right]^2$

The concentration of fluoride ions in the solution is as follows:

$\left[ F ^{-}\right]=2 s$

Thus, $s=\frac{1}{2}\left[ F ^{-}\right]$

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