Question
Q1. Differentiate between molality and molarity. ( 2 marks)
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Ask by Chambers Reed. in Papua New Guinea
Mar 22,2025
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Answer
Molarity measures the number of moles of solute per liter of solution and is affected by temperature. Molality measures the number of moles of solute per kilogram of solvent and is not affected by temperature.
Solution
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Molarity
- Defined as the number of moles of solute per liter of solution.
- Expressed mathematically as:
- It is temperature-dependent since the volume of the solution can change with temperature.
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Molality
- Defined as the number of moles of solute per kilogram of solvent.
- Expressed mathematically as:
- It is temperature-independent because it is based on mass, which does not change with temperature.
Thus, the primary differences are the basis of measurement—volume versus mass—and the dependence on temperature.
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Molality measures the number of moles of solute per kilogram of solvent, making it particularly useful when temperature changes may affect volume, like in reactions that generate heat. So, if you’re brewing up a potent concoction and need stability against temperature shifts, look to molality!
On the other hand, molarity is all about the volume of the solution, calculated as moles of solute per liter of solution. This measurement is key for many laboratory practices and is often used in titration experiments, where precise concentrations lead to accurate results. So, for your next chemistry class, remember that molarity is your go-to for mixing solutions!
