Multiple Choice
Why does the addition of acid increase the solubility of calcium phosphate (Ca3(PO4)2) in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Why is cooling a solution often necessary to induce crystallization during a recrystallization process?
A
Cooling speeds up the evaporation of the solvent, leading to crystallization.
B
Cooling decreases the solubility of the solute, allowing it to form crystals.
C
Cooling increases the solubility of the solute, causing it to precipitate.
D
Cooling causes impurities to dissolve, leaving only pure crystals.
Verified step by step guidance1
Understand that recrystallization is a purification technique that relies on the difference in solubility of a solute in a solvent at different temperatures.
Recognize that solubility generally increases with temperature, meaning more solute can dissolve in hot solvent than in cold solvent.
When the solution is cooled, the solubility of the solute decreases, so the excess solute that can no longer stay dissolved begins to come out of solution as solid crystals.
These crystals are typically purer because impurities tend to remain dissolved in the solvent rather than crystallizing out.
Therefore, cooling is necessary to reduce solubility and promote the formation of pure crystals during recrystallization.
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