Question

The stoichiometry and solubility product of a salt with the solubility curve given below is, respectively:

• A. $X_2Y, 2 \times 10^{-9} M^3$
• B. $XY_2, 1 \times 10^{-9} M^3$
• C. $XY_2, 4 \times 10^{-9} M^3$
• D. $XY, 2 \times 10^{-6} M^3$

Answer 1

Answer: (C)

From the graph & dimensions salt is : $XY_{2}$
$\left[X\right] = 1 × 10^{-3}M$
$\left[Y\right] = 2 × 10^{-3}M$
$XY_2(s) \rightleftharpoons X^{2+}_{(aq.)} +2Y^-_{(aq)}$
$ksp = [X^{2+}] [Y^-]^2$
$= (10^{-3}) (2 × 10^{-3})^2$
$= 4 × 10^{-9}\, M^3$