Question

This is a report from a lab experiment.

see the Question below that related to the report.

UOIT CHEM 1020U 1800U, S17: Exp. 3-6.12 Results, Discussion and Questions NOTE: This is a very long report to prepare. Do not leave it to the last minute! Part I: NaOH HC Run I mass of empty calorimeter /g mass of calorimeter +solution (end of run) g mass of solution /g 22.67 Temp. "C 2 9 Time s Temp. /°C Time /s NaoH 2了 2夕 29 2 9 570 12o 50 130 Pmin 210 24o 270 了00 33 o 360 3 96 42o H5 0 2 3 2了 23 29 29 2 9 ,2夕 29 29 29 29 2 9 NaOH Hcl 109

Explain, please!

Answer 1

A perfect calorimeter does not absorb any heat and nor does it lose any heat. But in this case q_calorimeter < 0 shows that the calorimeter also gives off heat to the reaction.

This means that the reaction absorbs more energy than it should have in the ideal case.

So the temperature difference will be larger than it should have been becaus of the input from calorimeter as well.

Thus the measured dH_rxn would be more endothermic than the true dH_rxn.

Hope this helps !