En un vaso se han puesto 250 g de alcohol junto con 2 g de yodo, que se disuelven comletamente. a: Calcula la concentración de la disolución en % masa.
b: ¿Cuántos gramos de disolución habrá que coger para que al evaporarse el alcohol queden 0,5 g de yodo sólido?
c: si tomamos 50 g de disolución y dejamos evaporar el alcohol. ¿cuántos g de yodo quedan?

Answerthis solution will not form a precipitateexplanationsolubility equilbrium:         pbf₂(s)  ⇄ pb²⁺(aq) + 2 f⁻(aq)the solubility product expression is    (we exclude solids from the equilibrium expression).now suppose we have the trial ion product q, which we can define as    then, we can interpret  q as the product of the concentration of the ions that we have and ksp as the product of the ion concentrations that are needed to form a saturated solution.if q > ksp, then that implies that there will be a surplus of ions that exceed the amount that is required to form a saturated solution. a precipitate will then form (the precipitate continually  forms until the surplus ions are removed and q is decreased to ksp's value).if q = ksp, the saturated solution that forms is barely saturated and the precipitate will be minimal.if q < ksp, then the ion concentration will not be enough to form a saturated solution (so no precipitate).using our information, we calculate the trial ion product:     since q = 2.7  × 10⁻⁸ < ksp =  4  ×  10⁻⁸, a precipitate will not form.

The answer is false because: gravitational force is independent of medium and depends only on the masses of the two objects and the distance between them

Ansaquatic plants;