CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
A saturated sucrose solution is prepared at 25∘C, filtered through standard filter paper, and yields a clear filtrate. The filtrate is then cooled to 5∘C and filtered again through the same paper. Which of the following outcomes and explanations is most likely for the second filtration?
(a) No sucrose will be retained because sucrose solubility is nearly independent of temperature, so the solution remains completely dissolved and passes through unchanged.
(b) Ice crystals of water will form at 5∘C and be stopped by the filter, while the dissolved sucrose passes through with the liquid phase.
(c) Crystalline sucrose will now be retained because cooling lowers solubility, allowing crystals larger than the filter pores to form and be trapped.
(d) Any sucrose that precipitates will be in particles so fine that they pass through the paper, so nothing is collected on the second filter.