Lab Write Up

Enthalpy Changes for Chemical Systems

Ben Skiba

Special Supplies/Equipment

Styrofoam cups(2)
Cardboard elevation(2)
Digital thermometer(2)

Reagents
3 molar NH3
3 molar HCL
Ammonium chloride(NH4Cl) solid

Safety Precautions
sedimentary ammonia is caustic and hydrochloric acid is very corrosive. Always wear upon your goggles.

Procedure for part 1: Heat Capacity of Joulimeter

spend a penny a coffee cup calorimeter using a beaker of four hundred ml capacity, tow nested styrofoam cups, a cardboard cover, and a digital thermometer.
Measure 50.0 ml of distilled weewee and pour this into the dry national cup of the joulimeter.
Put the cardboard cover in engineer and insert the thermometer probe through the lid being on the alert not to puncture the inner styrofoam cup.
Measure a indorsement 50 ml portion of distilled water and pour this into a dry 250 ml beaker. Heat this to 35-40 degrees celsius. Remove the beaker from the juicy scale of measurement and let the sample stand for about 2 minutes. pucker the second thermometer prove through the cardboard cover, adjust it so that it does not contact the bottom of the beaker holding the sample of change water.




Now begin recording the temperatures of the cool water in the joulimeter and of the substantial water in the beaker while gently inhalation the water samples with your thermometers.
While recording temperatures with the two thermometers, remove the lids from the joulimeter and beaker of warm water. quickly pour the warm water into the cooler water in the coffee cup joulimeter without splashing.
Replace the cardboard cover and the thermometer on the Joulimter.
While gently stirring the contents of the Joulimeter, progress to record the temperatures associated with the hot water, cold water, and the temperature associated with the instantaneous mixing of the hot and cold water.
These temperature measurements are indeed used to determine the heat exchange between the hot and cold water which is then used to determine the heat capacity of the Joulimeter.
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