Barium ions are poisonous. Patients with digestive tract problems are sometimes given an X-ray after they have?Barium ions are poisonous. Patients with digestive tract problems are sometimes given
an X-ray after they have swallowed a 'barium meal', consisting of a suspension of
BaSO4 in water. The [Ba2+(aq)] in a saturated solution of BaSO4 is too low to cause
problems of toxicity.
(i) Write an expression for the solubility product, Ksp, for BaSO4, including its units.
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(ii) The numerical value of Ksp is 1.30 × 10–10. Calculate [Ba2+(aq)] in a saturated
solution of BaSO4.
Posted by sjbiis
BaSO4(s) ⇄ Ba^2+(aq) + [SO4]^2-(aq)
x → x x
Ksp = [Ba^2+][[SO4]^2-] = 1.30 × 10^-10 mol^2 L^-2 (mol per liter squared). [BaSO4(s)] is assumed const (solid) and is taken into the Keq to give Ksp. Let conc of BaSO4 at equilibrium be x .: (eqn) [Ba^2+] = [[SO4]^2-] = x; putting into Ksp
Ksp = [x][[x] = x^2 = 1.30 × 10^-10
x = √(1.30 × 10^-10) = 1.14 × 10^-5 mol L^-1
You can convert this to g L^-1 (or per 100 g H2O) I hope.
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