Discussion Overview
The discussion revolves around calculating the change in enthalpy (delta H) for the reaction between 25.0 g of NaOH and 100 ml of 31.5% HCl, given a temperature change of 6.2 degrees Celsius. The context includes a homework problem involving thermochemical calculations in an aqueous environment.
Discussion Character
- Homework-related
- Mathematical reasoning
Main Points Raised
- One participant proposes using the equation Q = mcΔT to calculate delta H, where m is mass, c is the specific heat capacity of water, and ΔT is the temperature change.
- Another participant agrees with the general approach but challenges the assumption of using the specific heat capacity of water, noting that 31.5% HCl is not a diluted solution and that this assumption may not be valid for concentrated solutions.
- A later post questions how to calculate delta H without a value for mass when mixing two aqueous solutions.
Areas of Agreement / Disagreement
Participants generally agree on the approach to use the heat equation but disagree on the appropriateness of using the specific heat capacity of water for the concentrated HCl solution. The discussion remains unresolved regarding the calculation of delta H without a mass value.
Contextual Notes
There are limitations regarding the assumption of specific heat capacity for concentrated solutions and the lack of mass value for the calculation.