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Answer:
Molarity is the amount (in mole) of solute in a solvent. If the solute is very volatile, then it will evaporated from the solution as temperature rising. So the amount of solute is decreasing, causing the molarity decreasing. If the solvent itself volatile, then the molarity will increase.
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The relationship between evaporation and molarity is; the rate of evaporation of will decrease as the molarity increases
What is evaporation and molarity?
Molarity (M) is defined as the amount of a substance in a certain volume of solution. Molarity can also be defined as the number of moles of a solute per liters of a solution.
Now, the rate of evaporation of will decrease as the solute concentration increases due to the fact that for the same surface area for evaporation, as the concentration of the solute increases, less water molecules will get exposed to escape from the water surface.
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