The data for the reaction between HCl and NaOH were as follows: If the temperatu

Question

The data for the reaction between HCl and NaOH were as follows:

If the temperatures of the acid and base at the time of mixing are different, use their average as the temperature of the mixture before reaction. Use the average also as the initial temperature of the calorimeter.

What is the change in temperature experienced by the reaction mixture (and the calorimeter) extrapolated back to the time of mixing?

Value Units Concentration of HCl 2.16 M Volume of HCl 50.0 mL Density of HCl 1.02 g/mL Concentration of NaOH 2.38 M Volume of NaOH 55.0 mL Density of NaOH 1.02 g/mL Specific Heat of HCl & & NaOH & Reaction Mixture 3.97 J/mol-K Temperature of HCl at 3.0 min, Tacid (from graph) 26.5 oC Temperature of NaOH at 3.0 min, Tbase (from graph) 27.1 oC Temperature of reaction mixture at 3.0 min, Tmix  (from graph) 40.1 oC

Explanation / Answer

26.5+27.1 =53.6 / 2= 26.8

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