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70 grams of potassium nitrate completely dissolve in a solution at 55°C. The same amount of solute remains dissolved when the temperature of the solution drops to 45°C, until a ____ crystal is added. At this point the excess solute rapidly falls out of the solution.

User Amarsuperstar
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Step-by-step explanation:

We form a supersaturated solution. At 45 °C the solution has more potassium nitrate that can be dissolved. The recrystallization of the excess dissolved solute can be started inserting a crystal that is called seed crystal.

Answer: seed

User Yasitha Waduge
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