It must be taken into account, however, that some of the heat reel eased or absorbed in the reaction will be absorbed by the calorimeter itself. This ammo NT must be determined experimentally and is referred to as the heat capacity of the color emitter. This means the amount of heat required to raise the temperature 1 Kelvin. The he at ca opacity of the calorimeter can be determined by using the following equation: LA =- AT (heat capacity of calorimeter + heat capacity of contents) Procedure: A.
Heat Capacity of Calorimeter Construct a calorimeter by nesting two Styrofoam cups together. Use a cork b ore to make a hole in the lid just big enough to admit the thermometer; then slip the there meter into a split manhole rubber stopper, which prevents you from placing the thermometer t ooh deeply in the calorimeter. The thermometer should not touch the bottom of the cup. Rest t he entire apparatus in a 400 ml beaker to provide stability. Place exactly 50. 0 ml of distill led water in the calorimeter cup and replace the cover and thermometer.
Allow 5 to 10 minute sees for the system to reach thermal equilibrium; then record the temperature to the nearest O. 10 C on the report sheet. Place exactly 50. 0 ml of distilled water in a clean, dry 250 ml beaker an d heat the water with a low flame until the temperature is approximately 1 50 to ICC ABA eve room temperature. Do not heat to boiling; otherwise appreciable water will be lost, I eating to an erroneous result. Allow the hot water to stand for a minute or two; quickly race rod its temperature to the nearest O.
OIC on the report sheet and pour as much as pop usable into the calorimeter. Replace the lid with the thermometer and carefully stir the water with the thermometer. Observe the temperature for the next 3 min and record the et enrapture every 15 s on the temperature versus time data sheet at the end of the report page s. Plot the temperature as a function of time. Determine AT room your curve; then do the calculations indicated on the report sheet. B. Heat of Naturalization of HCI Noah Dry the calorimeter and the thermometer with a towel.
Carefully measure 50. O ml of 1. 0 M Noah and add it to the calorimeter. Place the lid on the calorimeter, but leave the thermometer out. Measure exactly 50. 0 ml of 1. 0 M HCI into a dry beaker. All owe it to stand near the calorimeter for 3 to 4 min. Measure the temperature of the acid, rinse thermometer with distilled water, and wipe dry. Insert the thermometer into t he calorimeter and measure the temperature of the Noah solution. The temperatures of the e Noah and the HCI should not differ by more than 0. ICC.
If the difference is greater than that, adjust the temperature of the HCI by either warming it by holding the beaker in your ha ends or cooling the outside of the beaker with tap water until the temperature of the HCI is within 0. 50 C of that of the Noah; record the temperature. Lift the lid and carefully add the 1. 0 M HCI all at once. Be careful not to splash any on the upper sides of the cup. Stir the solution gentle y every 15 s for the next 3 min. Construct a demonstrativeness’s curve and determine AT Calculate the heat of naturalization per mole of water formed.