Molal concentraion. Gen Chem 2

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In summary, to find the approximate molal concentration of pure ether, you can use the equation ΔTb = Kb * m, where ΔTb is the change in boiling point temperature, Kb is 2.02, and 37 degrees Celsius is the normal boiling point. To solve for m, you can use the equation ΔTb/Kb = m, but you also need to know the boiling point of the mixture. Without this information, the calculation will not be accurate.
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Torshi
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Homework Statement



What is the approximate molal concentration of the solute pure ether? Kb is 2.02, normal boiling point is 37 degrees Celsius.

Homework Equations



ΔTb= Kb * m

ΔTb is the change in boiling point temp.
Kb for ether is 2.02
m is the molal concentration which I am trying to find.
37 celsius is the normal boiling point

The Attempt at a Solution

ΔTb/Kb = m

i tried 37 degrees divided by (Kb value 2.02), and i also tried 137/2.02 -> i added 100 degrees because the boiling point elevation thing. Both answers were wrong
 
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You need to know boiling point of your mixture, without it you will be not able to calculate bp elevation.
 

1. What is molal concentration?

Molal concentration, also known as molality, is a measure of the concentration of a solute in a solution in terms of the amount of moles of solute per kilogram of solvent.

2. How is molal concentration different from molar concentration?

Molal concentration is different from molar concentration in that molar concentration is a measure of the concentration of a solute in terms of the amount of moles of solute per liter of solution, while molal concentration is per kilogram of solvent. This means that molal concentration takes into account the physical properties of the solvent, such as density, which can change with temperature.

3. How is molal concentration calculated?

Molal concentration is calculated by dividing the number of moles of solute by the mass of the solvent in kilograms. The formula is molality (m) = moles of solute (n) / mass of solvent (kg).

4. Why is molal concentration important?

Molal concentration is important because it is a more accurate measure of concentration in solutions, especially when dealing with solutions that undergo changes in temperature or pressure. It also allows for comparison of solutions with different solvents, as molarity is affected by the volume of the solution, while molality is not.

5. How is molal concentration used in the real world?

Molal concentration is used in a variety of industries and scientific fields, such as pharmaceuticals, food and beverage production, and environmental studies. It is also used in the laboratory setting for preparing solutions with specific concentrations and for calculating properties of solutions, such as freezing point depression and boiling point elevation.

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