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Fun Video: Molarity & Molality Video Lecture - Chemistry Class 11 - NEET

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FAQs on Fun Video: Molarity & Molality Video Lecture - Chemistry Class 11 - NEET

1. What is the difference between molarity and molality in chemistry?
Ans. Molarity is a measure of the concentration of a solute in a solution, expressed as the number of moles of solute per liter of solution. On the other hand, molality is also a measure of concentration but is expressed as the number of moles of solute per kilogram of solvent. So, molarity considers the volume of the solution, while molality considers the mass of the solvent.
2. How can molarity and molality be calculated?
Ans. Molarity can be calculated by dividing the number of moles of solute by the volume of the solution in liters. Molality, on the other hand, is calculated by dividing the number of moles of solute by the mass of the solvent in kilograms. The formulas for molarity and molality are given as: Molarity (M) = moles of solute / liters of solution Molality (m) = moles of solute / kilograms of solvent
3. Which concentration measurement, molarity or molality, is more commonly used in laboratory experiments?
Ans. Molarity is more commonly used in laboratory experiments due to its practicality. It is easier to measure the volume of a solution accurately compared to measuring the mass of the solvent. Molarity is also more convenient for preparing solutions since volumes are typically easier to work with in a laboratory setting.
4. Are molarity and molality interchangeable? Can they be used interchangeably in calculations?
Ans. Molarity and molality are not interchangeable, and they cannot be used interchangeably in calculations. They represent different ways of expressing concentration and involve different units (moles per liter for molarity and moles per kilogram for molality). It is important to use the appropriate concentration measurement based on the specific requirements of the problem or experiment.
5. Can molarity and molality have the same numerical value for a given solution?
Ans. Yes, molarity and molality can have the same numerical value for a given solution, but this is not always the case. It depends on the density of the solvent and its molar mass. If the solvent has a density close to 1 g/cm^3 and its molar mass is approximately equal to 1 g/mol, then the molarity and molality may have similar values. However, in most cases, the numerical values of molarity and molality will differ due to the differences in their units of concentration measurement.
195 videos|337 docs|190 tests
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