# Is the calculated enthelpy of solution more positive

• disneychannel
In summary, the calculated enthalpy of solution for an endothermic dissolving process will be more negative than it should be because the heat absorbed by the calorimeter is included in the calculation and is not available to contribute to the enthalpy of the solution. It is important to take this into account when calculating the enthalpy of solution.
disneychannel

## Homework Statement

Because heat is absorbed from the calorimeter from an endothermic dissolving process, is the calculated enthalpy of solution more positive or more negative from what it should be?

## The Attempt at a Solution

I though it would be more positive because an endothermic reaction is one in which the heat goes into the system, causing the enthalpy to increase.

But, somewhere I read that if you have an endothermic reaction, the calorimeter would release some heat; ΔH(total) that looks only at the heat of the mixture would give a less positive number (or less negative number).

This is a great question! The calculated enthalpy of solution would actually be more negative than it should be. This is because the heat absorbed by the calorimeter is included in the calculation of the enthalpy of solution. Since the heat is absorbed by the calorimeter, it is not available to contribute to the enthalpy of the solution. Therefore, the measured enthalpy of solution will be lower than the actual enthalpy of the reaction. This is why it is important to take into account the heat absorbed by the calorimeter when calculating the enthalpy of solution.

## 1. What is enthalpy of solution?

Enthalpy of solution is the amount of heat energy that is either released or absorbed when a solute dissolves in a solvent to form a solution. It is a measure of the change in internal energy of a system during the process of dissolution.

## 2. How is enthalpy of solution calculated?

The enthalpy of solution can be calculated by subtracting the sum of the enthalpies of the pure components (solute and solvent) from the enthalpy of the solution. This can be represented by the equation ∆Hsoln = ∆Hsolvent + ∆Hsolute.

## 3. Is a more positive enthalpy of solution favorable?

A more positive enthalpy of solution indicates that energy is absorbed during the dissolution process. This could be due to the solute breaking bonds in the solvent or vice versa. In general, a positive enthalpy of solution is not as favorable as a negative enthalpy of solution, which indicates an exothermic process.

## 4. How does temperature affect enthalpy of solution?

Temperature can have a significant impact on the enthalpy of solution. As temperature increases, the average kinetic energy of the molecules increases, making it easier for them to overcome intermolecular forces and dissolve. This can result in a more positive enthalpy of solution, as more energy is required to break the intermolecular bonds.

## 5. What factors can affect the calculated enthalpy of solution?

In addition to temperature, factors such as the nature of the solute and solvent, the concentration of the solution, and the pressure can also affect the enthalpy of solution. Additionally, any chemical reactions that occur during the dissolution process can also impact the calculated enthalpy of solution.

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