Mixing Solutions: Understanding Volume & Enthalpy

In summary, an ideal solution is one in which the change in volume and enthalpy upon mixing are zero, and Raoults law follows indirectly from this. Many combinations of real species exhibit behavior close to ideal solution behavior. When mixing two volumes of the same liquid, the total volume and heat effects remain unchanged due to the unchanged molecular interactions. When mixing two liquids with similar molecules, the change in volume and enthalpy will be minimal due to the similarity in energetic interactions between the molecules. For more information, refer to Smith and Van Ness' introduction to chemical engineering thermodynamics.
  • #1
kartikwat
49
0
Why there no change in volume and enthalpy of solution when two components are mixed
 
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  • #2
What is the definition of an ideal solution?
 
  • #3
Solution which follows raoutlts law over all range of concenteration.
 
  • #4
And its components are of same nature
 
  • #5
An ideal solution is one for which the change in volume and enthalpy upon mixing are zero. Raoults law follows indirectly from this. Many combinations of real species exhibit behavior close to ideal solution behavior.

Chet
 
  • #6
Chestermiller said:
An ideal solution is one for which the change in volume and enthalpy upon mixing are zero. Raoults law follows indirectly from this. Many combinations of real species exhibit behavior close to ideal solution behavior.

Chet

So my question is why enthalpy or volume doesn't change
 
  • #7
If you mix two volumes of the same liquid, the total volume doesn't change, and there are no heat effects because the molecular interactions don't change. If you mix two liquids whose molecules are very similar, the volume and enthalpy will change very little, because the energetic interactions between the molecules of the solution will be very similar to those of the original pure liquids. For more details on this, see Smith and Van Ness, intro to chem engg thermo.

Chet
 

1. What is the definition of volume in mixing solutions?

Volume refers to the amount of space occupied by a substance or solution. In the context of mixing solutions, volume is typically measured in units such as liters or milliliters.

2. How does the volume of a solution affect the mixing process?

The volume of a solution plays a crucial role in the mixing process because it determines the concentration of the solution. A larger volume of solution will result in a lower concentration, while a smaller volume will result in a higher concentration.

3. What is enthalpy and how does it relate to mixing solutions?

Enthalpy is a measure of the total energy of a system. In the context of mixing solutions, enthalpy is important because it determines the amount of heat energy that is released or absorbed during the mixing process.

4. How can I calculate the enthalpy change during the mixing of two solutions?

The enthalpy change during mixing can be calculated using the formula ΔH = Q/m, where ΔH is the enthalpy change, Q is the heat energy released or absorbed, and m is the mass of the solution.

5. What are some common mistakes to avoid when mixing solutions?

Some common mistakes to avoid when mixing solutions include using incorrect measurements, not accounting for the enthalpy change, and not properly mixing the solutions together. It is important to carefully follow instructions and double-check measurements to ensure accurate and successful mixing.

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