Procedure/Observations
HClO4
A student studied the enthalpy of neutralization of HNO2 and NaOH by reacting 50.0 mL of 2.00 M HClO4 with 50.0 mL of 2.00 M NaOH in a calorimeter. He measured the temperature versus time for 15 minutes. The first 4.5 minutes show the temperature of the acid and base before mixing. The solutions were mixed at the 5 minute mark and the temperature of the resulting salt solution measured for 10 minutes to give the following data.
Time, Minutes | Solution Temperature, °C
0.0 | (Acid/Base) 23.25
0.5 | (Acid/Base) 23.27
1.0 | (Acid/Base) 23.28
1.5 | (Acid/Base) 23.30
2.0 | (Acid/Base) 23.30
3.0 | (Acid/Base) 23.35
4.0 | (Acid/Base) 23.44
4.5 | (Acid/Base) 23.47
5.0 | Acid & Base Mixed
6.0 | (Salt Solution) 33.50
7.0 | (Salt Solution) 33.55
8.0 | (Salt Solution) 33.48
9.0 | (Salt Solution) 33.32
10.0 | (Salt Solution) 33.25
11.0 | (Salt Solution) 33.20
12.0 | (Salt Solution) 33.05
13.0 | (Salt Solution) 32.96
14.0 | (Salt Solution) 32.80
15.0 | (Salt Solution) 32.75
