Heats of Reaction Lab Report Essay
Purpose: To measure the heats of reaction for three related exothermic reactions and to verify Hess’s Law of Heat Summation.
NaOH(s) ( Na+(aq) + OH-(aq) ΔH = -10.6kcal/mol
NaOH(s) + H+(aq) + Cl-(aq) ( H2O + Na+(aq) + Cl-(aq) ΔH = -23.9kcal/mol
Na+(aq) + OH-(aq) + H+(aq) + Cl-(aq) ( H2O + Na+(aq) + Cl-(aq) ΔH = -13.3kcal/mol
Background: Energy changes occur in all chemical reactions; energy is either absorbed or released. If energy is released in the form of heat, the reaction is called exothermic.
If energy is absorbed, the reaction is called endothermic.
Materials: spatula sodium hydroxide pellets (NaOH) 1 Styrofoam cup 1.0 M sodium hydroxide (NaOH) 1 100-mL graduated …show more content…
Data Table 1: Observations
| |Reaction 1 |Reaction 2 | |Reaction 3 |
|Volume of Water (ml) | |------------ |Volume 1M HCl (ml) | |
|Volume 0.5M HCl (ml) |------------- | |Initial Temp HCl ˚C | |
|Mass of NaOH (g) | | |Volume 1M NaOH (ml) | |
|Initial Temp ˚C