In the “Medical Cold Pack” lab certain unknown salts were dissolved in water in a calorimeter. The
following data was collected and recorded in the experiment.
Trial Volume of water (mL) Mass of salt (g) Initial Temperature (o

C) Final Temperature (o
C)
1 100.0 8.5 17.5 11.0
2 75.0 9.0 18.0 8.5
3 85.0 9.3 17.5 9.0
Use the collected experimental data and the reference data to identify the unknown salt used in this
experiment. (6 mks) (cwater = 4.18 J/go
C)

Salt NH4Cl KNO3 NaC2H3O2 NH4NO3 KCl
Enthalpy of Solution (kJ/g) 0.227 0.345 0.144 0.321 0.231