During science class, while studying mixtures, you mix together iron filings and sand. Your teacher challenges you to separate the sand from the iron filings. How could you use the physical properties of matter to practically separate the two solids? A) Add water to the mixture and dissolve the sand. B) Pick out one of the two solids by using color to guide you. C) Pour the mixture through a paper filter to separate the two. D) Use a magnet to pull out the iron filings as they are attracted to a magnet. usatesprep question

C. control over the business

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.

Answerlimiting reactant;