Solubility
Chemistry · 50 practice questions
Unsaturated, saturated and supersaturated solutions; solubility curves and calculations (mole per dm³); solvents for fats, oils and paints and their use in removing stains; true and false solutions (suspensions and colloids) — properties and examples (harmattan haze and water paints as suspensions; fog, milk, aerosol spray, emulsion paints and rubber solution as colloids).
- Distinguish between the different types of solutions.
- Interpret solubility curves.
- Calculate the amount of solute that dissolves in a given solvent at a given temperature.
- Deduce that solubility is temperature-dependent.
- Relate the nature of solvents to their uses.
- Differentiate true solutions, suspensions and colloids and provide typical examples of each.
Try a few questions
- Practice question 1
The rate at which a solute actually dissolves, as distinct from its overall solubility, can mainly be increased by
- A.cooling the solvent to a much lower temperature
- B.stirring, heating, or increasing the surface area of the solute
- C.using a much larger, single lump of solute instead of smaller pieces
- D.leaving the mixture completely undisturbed for a very long time
Show the answer
B. stirring, heating, or increasing the surface area of the solute
These practical measures all help solvent molecules reach and dissolve the solute particles more quickly.
- Practice question 2
A sol, a type of colloid consisting of solid particles dispersed in a liquid, is exemplified by
- A.jelly
- B.fog
- C.paint
- D.aerosol spray
Show the answer
C. paint
Paint is a classic example of a sol, with fine solid particles dispersed throughout a liquid medium.
- Practice question 3
An unsaturated solution is one that
- A.has already dissolved the maximum possible amount of solute at that temperature
- B.can still dissolve more solute at that particular temperature
- C.contains more dissolved solute than is normally possible at that temperature
- D.contains no dissolved solute whatsoever
Show the answer
B. can still dissolve more solute at that particular temperature
An unsaturated solution has room left to dissolve additional solute before reaching saturation.
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