Which statement about the effectiveness of gravity filtration using standard…
CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
Which statement about the effectiveness of gravity filtration using standard laboratory filter paper is most accurate when comparing colloidal dispersions with true solutions?
(a) Ordinary filter paper removes colloids because the charged particles are adsorbed onto the cellulose fibers, but it cannot retain the neutral solute species of a true solution.
(b) The slower Brownian motion of the larger colloidal particles causes them to be trapped on the paper, whereas the faster-moving solute particles of a true solution pass through.
(c) Because the typical pore size of ordinary filter paper (≈2–5μm) is much larger than the diameter of both true‐solution solute species (<1 nm) and most colloidal particles (≈1–1000 nm), gravity filtration generally allows both to pass through essentially unchanged.
(d) Colloidal particles tend to aggregate into clumps larger than the filter pores, so gravity filtration effectively separates colloids, while the ions and molecules of a true solution remain in the filtrate.